FISCHER DE43 User manual

*09005642* BA_EN_DE43 Rev.B 02/18

*09005642*

1 Safety instructions

1.1 General

This operating manual contains in-

structions fundamental to the installa-

tion, operation and maintenance of

the device that must be observed un-

conditionally. It must be read by the

assembler, operator and the specialized personnel

in charge of the instrument before it is installed and

put into operation. This operating manual must be

kept in an easily accessible place at the place of in-

stallation.

The subsequent sections on general safety instruc-

tions (1.2 - 1.7) as well as the following special in-

structions in particular about assembly, commis-

sioning and maintenance (2 to 10) contain im-

portant safety instructions, the non-observance of

which can endanger persons, animal and physical

objects.

1.2 Personnel Qualification

Staff assigned to assembly, operating, maintenance

and inspection tasks shall be adequately qualified

for this work and must be sufficiently instructed and

trained to meet the requirements of assembly, op-

erating, maintenance and inspection work.

1.3 Risks due to Non-Observance

of Safety Instructions

Non-observance of these safety instructions, the in-

tended use of the device or the limit values given in

the technical specifications can be hazardous or

cause harm to persons, the environment or the

plant itself. Fischer Mess- und Regeltechnik GmbH

will not be liable for damage claims if this should

happen.

1.4 Safety Instructions for the Operating

Company and the Operator

The safety instructions governing correct operation

of the instrument must be observed. The operating

company must make them available to the installa-

tion, maintenance, inspection and operating per-

sonnel. Dangers arising from electrical components,

energy discharged by the medium, escaping medi-

um and incorrect installation of the instrument must

be eliminated. For more information, please see the

applicable national and international regulations,

such as DIN, EN, accident prevention regulations

(UVV) and - for industry-specific individual applica-

tions - also in the industry guidelines issued by the

DVWG, Ex, GL, etc. as well as VDE and local EVUs

Operating Manual

DE43

Digital 2-channel transmitter for direct

connection to bus-capable automation devices

Table of contents

1Safety instructions

2Application purpose

3Description of the product

4Installation and assembly

5Commissioning User guide

6Maintenance

7Transport

8Service

9Accessories

10 Disposal

11 Technical data

12 Dimensional drawings

13 Order Codes

14 Declaration of conformity

2 | 12 Page

1.5 Unauthorised Modification

Modifications of or other technical alterations to the

instrument by the customer are not permitted. This

also applies to replacement parts. Any modifica-

tions / alterations required must be carried out by

Fischer Mess- und Regeltechnik GmbH only.

1.6 Inadmissible Modes of Operation

The operational safety of this instrument can only

be guaranteed if it is used as intended. The instru-

ment model must be suitable for the medium used

in the system. The limit values given in the technical

data may not be exceeded.

1.7 Safe working practices for mainte-

nance and installation work

The safety instructions given in this operating man-

ual, any nationally applicable regulations on acci-

dent prevention and any of the operating company's

internal work, operating and safety guidelines must

be observed.

The operating company is responsible for ensuring

that all required maintenance, inspection and instal-

lation work is carried out by qualified specialized

personnel.

1.8 Pictogram explanation

WARNING!

… indicates a potentially dangerous situation

that could lead to death or serious injuries if not

avoided.

Information!

… highlights important information for efficient

and smooth operation.

Tip!

… indicates recommendations that are not spe-

cifically necessary in certain situations but which

could be useful.

2 Application purpose

The bus-capable 2-channel transmitter is suitable

for measuring pressure, under-pressure, and differ-

ential pressure in neutral gaseous media.

3 Description of the product

3.1 Function diagram

3.2 Design and mode of operation

The basis of this transmitter comprises two piezore-

sistive sensors.

The pressure that is to be measured acts upon a

silicone membrane that is equipped with a resistor

bridge. The acting pressure causes the membrane

to move and therefore a change in resistance. The

bridge signal is analysed by the integrated electron-

ics and converted to a pressure value. This is for-

warded to the overriding control system via an inter-

face on request.

The device also has connection options for up to 4

proximity switches whose status is recorded via the

bus system.

4 Installation and assembly

All supply lines are arranged so that there are no

mechanical forces acting on the device.

The device is set ex-works for vertical installation,

however any installation position is possible.

4.1 Process connection

•By authorized and qualified specialized person-

nel only.

•The pipes need to be depressurized when the

device is being connected.

•Appropriate steps must be taken to protect the

device from pressure surges.

•Check the suitability of the device for the media

to be measured.

•Maximum pressures must be observed.

•Check that the pressure connections do not

leak before commissioning.

3 | 12 Page

The pressure sensing lines need to be kept as short

as possible and installed without sharp bends to

avoid interfering delay times.

The pressure connections are marked with (+) and

(-) symbols on the device. For differential pressure

measurements, the higher pressure is connected to

the (+) side and the lower pressure to the (-) side of

the device.

4.2 Electrical connection

•By authorized and qualified specialized person-

nel only.

•The electrical connection of the device shall be

performed according to relevant VDE and local

electricity board regulations.

•Disconnect the system from the mains before

connecting the device.

•Add a fuse adapted to the energy requirements.

4.2.1 ST1 (plug):

Supply and bus termination

Signal name

Cable colour

Coding

Supply

+Ub

brown

BUS-D1

white

Supply

-Ub

blue

BUS-D0

black

BUS-R

grey

4.2.2 ST2 (bush):

Supply and bus termination

Signal name

Cable colour

Coding

Supply

+Ub

brown

BUS-D1

white

Supply

-Ub

blue

BUS-D0

black

BUS-R

grey

4.2.3 Input 1 to 4 (bush)

Input for external potential-free contacts.

Signal name

Cable colour

brown

blue

Input N 1

black

4.2.4 Bus structure

The device is connected in a line network structure

via plug 1 and plug 2 as a slave to the Modbus RTU

network. Star-shaped networks are not allowed.

Communication is effected via a Modbus master

that is also connected to the bus system. Here, the

individual slaves only react to direct commands

from the master, which is why communication be-

tween the slaves is not possible.

In this way up to 127 bus participants of the type

DE43 can be connected without an amplifier to a

Modbus RTU network.

4.2.5 Supply circuit

Please note that the M12 plugs (ST1, ST2) are

suitable for max. 2A. This value may be exceeded if

there are more than 23 bus participants so that in-

termediate feeding is required at this point.

The max. number of bus participants per supply cir-

cuit depends on the number of existing digital inputs.

The power draw of a DE43 is calculated as follows:

𝑖𝑛𝑝𝑢𝑡 𝑐𝑢𝑟𝑟𝑒𝑛𝑡 = 0,055𝐴 + 𝑁𝑜.𝑜𝑓 𝐷𝑖𝑔𝑖𝑡𝑎𝑙𝑖𝑛𝑝𝑢𝑡𝑠 ∗ 0,0045𝐴

N : Input number

Bus termination

4 | 12 Page

4.2.6 Terminating resistors

We recommend terminating both end points of the Modbus RTU network with 120Ω resistors, which are availa-

ble separately, to guarantee error-free data transmission.

5 Commissioning

User guide

5.1 Requirements

All electrical supply, operating and measuring lines,

and the pressure connections must have been cor-

rectly installed before commissioning. All supply

lines are arranged so that there are no mechanical

forces acting on the device.

Also, basic know-how of the Modbus protocol and

the interface specification are required to commis-

sion the bus system. Experience of handling Mod-

bus RTU networks would also be advantageous.

A functional Modbus master is essential.

5.2 Configuration Modbus

The switch S8 is used to select between the inter-

face configuration and address setting. The switch

can remain in the respective setting after the con-

figuration process.

On restarting, the current setting for the interface or

address is accepted.

5.2.1 Setting the Baud rate, parity and stopbit

Remove the screw cap on the front of the device.

You are now in a position to reach the DIP switches

required for configuration.

The following convention applies:

Switch setting OFF

Switch setting ON

Switch setting any

First ensure that the switch S8 is in the

switch setting "ON" because otherwise you

will need to set the Modbus address.

5 | 12 Page

Baud rate

Parity

Stopbit

Set the baud rate as follows using the switches

S1 ... S3:

Baud rate

1200

2400

4800

9600

19200

38400

57600

Then select the parity you require using the switch-

es S4 and S5:

Parity

none

same

not the

same

Last, select the required number of stopbits via the

switch S6:

Stopbits

1 stopbit

2 stopbits

The selection of 2 stopbits in combination

with even or uneven parity is not allowed.

Ensure that all bus participants have the same in-

terface configuration.

Then briefly disconnect the device from the power

supply so that the settings are accepted after a re-

start.

5.2.2 Setting the Modbus address

Remove the screw cap on the front of the device.

You are now in a position to reach the DIP switches

required for configuration.

First ensure that the switch S8 is in the

switch setting "OFF" because otherwise

you will need to set the Modbus interface.

Modbus address

You can set the Modbus address using the switch

settings.

The switches S1…S7 represent the respective set-

ting value in the dual system. The resulting value in

the decimal system is shown in the next line.

If, for example, you want to set the address 24, you

need to set the switches S4 and S5 whilst the other

switches are at "OFF".

BIT

Priority

Switch set-

ting

The address is calculated as follows:

0*20

0*21

0*22

1*23

1*24

0*25

0*26

In total this equals the address = 24

Then briefly disconnect the device from the power

supply so that the settings are accepted after a re-

start.

5.3 Modbus functional description

5.3.1 Structure of Modbus telegram

The maximum size of a Modbus telegram is

256Byte.

The telegram comprises a 1 byte slave address, a 1

byte function code, the data and a 2 byte CRC-

checksum.

Slave ad-

dress

Function

code

Data

CRC

check

value

1 byte

0…252 bytes

2 bytes

5.3.2 Function code 0x02:

Read Discrete Inputs

This function code serves to read out the register of

the discrete inputs.

Every discrete input is shown as 1 bit. The bit value

1 corresponds to a high level and the bit value 0 to

a low level at the input.

The return value has a length of N/8 byte, whereby

N corresponds to the number of required discrete

inputs. Decimal places are rounded up.

6 | 12 Page

Function code 0x02 Read Discrete Inputs

Bit

Data type

Description

Unit

Span

Boolean

Digital input 1

0 / 1

Boolean

Digital input 2

0 / 1

Boolean

Digital input 3

0 / 1

Boolean

Digital input 4

0 / 1

5.3.3 Function code 0x03:

Read Holding Registers

With this function code, the hold register of the

slave can be read out.

Every hold register comprises 2 bytes. The first byte

contains the higher value bits and the second byte

contains the lower value bits.

The return value has a length of N*2 byte, whereby

N corresponds to the number of required hold regis-

ters.

Function code 0x03 Read Holding Registers

Address

Bit

Data type

Description

Unit

Span

Unsigned

Integer

Pressure sensor 1:

Sensor error

0 / 1

Pressure sensor 1:

Pressure too low

0 / 1

Pressure sensor 1:

Pressure too high

0 / 1

Reserved

0 / 1

Pressure sensor 2:

Sensor error

0 / 1

Pressure sensor 2:

Pressure too low

0 / 1

Pressure sensor 2:

Pressure too high

0 / 1

Reserved

0 / 1

Temp. sensor: Sen-

sor error

0 / 1

Temp. sensor:

Temp. too low

0 / 1

Temp. sensor:

Temp. too high

0 / 1

Reserved

0 / 1

General

system error

0 / 1

Reserved

0 / 1

Reserved

0 / 1

Reserved

0 / 1

5.3.4 Function code 0x2B/ 0x0E: Read Device

Identification

The function code 43/ 14 can be used to call up in-

formation about the device via the Modbus interface.

The DE43 supports the categories Basic and Regu-

lar. The following contains an overview of the avail-

able objects and their possible contents.

Function code 0x2B/ 0x0E: Read Device Identification

Object ID

Object

Name/

Descrip-

tion

string type

Category

string size

Example

0x00

Vendor

Name

ASCII

Basic

48 byte

"FISCHER Mess-

und Regeltechnik

GmbH"

0x01

Product

Code

ASCII

Basic

32 byte

"1234567.12.123"

0x02

Major

Minor

Revision

ASCII

Basic

32 byte

"F/W: v1.40 H/W:

Rev. B"

0x03

Vendor

URL

ASCII

Regular

32 byte

"www.fischermesst

echnik.de"

0x04

Product

Name

ASCII

Regular

32 byte

"DE43"

0x05

Model

Name

ASCII

Regular

48 byte

"Differential Pres-

sure Transducer"

0x06

User Ap-

plication

Name

ASCII

Regular

32 byte

"12345abcd"

5.3.5 Function code 0x04:

Read Input Registers

This code can be used to read out the input register

of the slave.

Each input register comprises 2 bytes. The first byte

contains the higher value bits and the second byte

contains the lower value bits.

7 | 12 Page

The return value has a length of N*2 byte, whereby

N corresponds to the number of required input reg-

isters.

Function code 0x04:

Read Input Registers

Address

Bit

Data

type

Description

Unit

Span

Integer

Pressure

measured

value channel

-400…+400

Integer

Pressure

measured

value channel

-1000…+1000

Integer

Temp. meas-

ured value

°C

-55…+125

The information for the measured pressure values

is shown as examples and can be read from the

type plate in specific cases.

5.4 LED flash codes

The operational status of the device is continuously

signalised via 2 LEDs. The green LED signalises

correct operation and will go off in the event of an

error. The error type is communicated via flash

codes of the red LED.

The following convention applies:

The LED shines permanently

very

short

The LED flashes for 0.2 s

short

The LED shines for approx. 0.5 s

long

The LED shines for approx. 1 s

---

The LED does not shine

Green

LED

Red

LED

Description

---

The DE43 is ready for operation

very

short

The DE43 sends an answer to the

master via the Modbus

---

1 x long

1 x short

Pressure sensor 1:

Error reading the sensor signal

---

1 x long

2 x short

Pressure sensor 2:

Error reading the sensor signal

---

1 x long

3 x short

Temperature sensor:

Error reading the sensor signal

---

1 x long

10 x short

Error reading the configuration pa-

rameter

---

1 x long

11 x short

Error writing the configuration pa-

rameter

---

1 x long

12 x short

Wrong configuration of the MODBUS

parameter

(Baud rate, parity, stopbits)

5.5 Modbus error codes

Code

Name

ILLEGAL FUNCTION

ILLEGAL DATA ADDRESS

ILLEGAL DATA VALUE

SERVER DEVICE FAILURE

6 Maintenance

The instrument is maintenance-free.

We recommend the following regular inspection to

guarantee reliable operation and a long service life:

•Check the function in combination with down-

stream components.

•Check the leak-tightness of the pressure con-

nection lines.

•Check the electrical connections.

The exact test cycles need to be adapted to the op-

erating and environmental conditions. If various in-

strument components interact, the operating in-

structions of all the other instruments also need to

be observed.

7 Transport

The measuring device must be protected against

impacts. It may only be transported in packaging

specifically intended for transport.

8 Service

All defective or faulty devices should be sent direct-

ly to our repair department. Please coordinate all

shipments with our sales department.

Process media residues in and

on dismantled devices can be a hazard to

people, animals and the environment. Take

adequate preventive measures. If required, the de-

vices must be cleaned thoroughly.

9 Accessories

•Terminating resistor

10 Disposal

For the sake of the environment....

Please help to protect our environment and

dispose of or recycle used instruments as

stipulated by the applicable regulations.

8 | 12 Page

11 Technical data

Positive ranges 0…

± ranges

Measurement range

mbar

±2.5

±4

±6

±10

±16

400

600

1000

1600

±250

±400

±600

±1000

±1600

kPa

0.4

0.6

1.6

±0.25

±0.4

±0.6

±1

±1.6

Max. stat. operating pressure

mbar

100

Bursting pressure

mbar

150

300

150

300

Characteristic curve de-

viation )

max.

%FS

1.0

typ.

%FS

0.5

Tk span°°)

max.

%FS/10K

1.0

0.3

1.0

0.5

0.3

typ.

%FS/10K

0.3

Tk zero-point °°)

max.

%FS/10K

1.0

0.4

1.0

0.5

0.4

typ.

%FS/10K

0.2

°) : Characteristic curve deviation (non-linearity and hysteresis) at 25°C

°°) : Compensation range 0 ... 60°C

General points

Admissible ambient temperature

-10 ... 70°C

Admissible media temperature

-10 ... 70°C

Admissible storage temperature

-20 ... 70°C

Enclosure protection class

IP65 acc. to DIN EN 60529

Damping (P=10…90%)

Electrical data

Rated Voltage

24 VDC

Allowed operating voltage Ub

18-30 VDC

Electrical connection type

RS 485 with Modbus-RTU protocol

Power consumption

max. 2 W

Ports

Modbus

2 x M12 round plug connector

Connector 1 for supply and bus signals (5-pin, male)

Plug 2 for forwarding to the next BUS participant or

to connect a BUS termination plug (5-pin, female)

Proximity switch

(Option for external potential-free contacts)

4 x M8 round plug connector

Input 1 (3-pin, female)

Input 2 (3-pin, female)

Input 3 (3-pin, female)

Input 4 (3-pin, female)

Pressure

Aluminium hose screw connections or hose 6/4mm and 8/6mm

Pneumatic plug connector for 6/4 mm hose and 8/6 mm hose

Communication parameter

valid Modbus specification

Application Protocol Specification V1.1b3 (April 26, 2012)

Address

1 … 127

Data format

Can be set

pre-set

1200 … 57600 Baud

Parity and 1 … 2 stopbits

9600 Baud

no parity and 1 stopbit

supported Modbus functions

Read Discrete Inputs

0x02

Read Holding Registers

0x03

Read Input Registers

0x04

Read Device Identification

0x2B / 0x0E

Materials, assembly

Casing material

Polyamide PA 6.6

Media-contacting material

Silicon, PVC, aluminium, brass

Assembly

attachment boreholes on rear side

Wall mounting

9 | 12 Page

12 Dimensional drawings

(all dimensions in mm unless otherwise specified)

Type plate

Pneumatic plug connector for 6/4 mm

hose and 8/6 mm

Model with pneumatic plug connector

Wall mounting plate

Rear view

without wall mounting plate

2 x M12 connector socket

CuZn, nickel-plated

Aluminium hose screw connections or

hose 6/4mm and 8/6mm

Boreholes for tapping

screws diam. 3.5 mm

Model with hose screw connection

2 x M8 plug connection left

4 x M8 plug connection

without M8 plug connec-

tion

2 x M8 plug connection right

Connection option for the inputs 1 to 4

10 | 12 Page

13 Order Codes

Digital 2-channel transmitter for direct connection to bus-capable automation devices

DE43

Channel 1 - measuring

range

allowed stat. operating

pressure

0 …4 mbar.......

... 50 mbar....................>

0 …6 mbar.......

... 50 mbar....................>

0 …10 mbar.......

. 100 mbar....................>

0 …16 mbar.......

. 100 mbar....................>

-2.5 …+2.5 mbar.......

... 50 mbar....................>

-4 …+4 mbar.......

... 50 mbar....................>

-6 …+6 mbar.......

... 50 mbar....................>

-10 …+10 mbar.......

. 100 mbar....................>

-16 …+16 mbar.......

. 100 mbar....................>

0 …400 Pa ..........

... 50 mbar....................>

0 …500 Pa ..........

... 50 mbar....................>

0 …600 Pa ..........

... 50 mbar....................>

0 …1000 Pa ..........

. 100 mbar....................>

0 …1600 Pa ..........

. 100 mbar....................>

-250 …+250 Pa ..........

... 50 mbar....................>

0 …1 kPa.........

... 50 mbar....................>

0 …1.6 kPa.........

. 100 mbar....................>

-1 …+1 kPa.........

... 50 mbar....................>

-1.6 …+1.6 kPa.........

. 100 mbar....................>

Channel 2 - measuring

range

allowed stat. operating

pressure

0 …4 mbar.......