National Instruments FieldPoint FP-1001 User manual

FieldPoint

™

is a trademark of National Instruments Corporation. Product and company names are

trademarks or trade names of their respective companies.

321698A-01

FP-1001

FieldPoint RS-485 Network Module

Highlights

• Isolated RS-485 interface to host computer or to FP-1000

repeater port

• Simple ASCII protocol is compatible with industry standard

Optomux protocol

• Built-in high efficiency power supply powers I/O modules

• Runs on 11 to 30 VDC power

• -40° to +70° C operation

Overview

The FP-1001 is a network module for the FieldPoint system. It

provides connection to an RS-485 network using a simple ASCII

protocol.

Thisdocumentprovidesaquickguidetoinstallingandconfiguring

the FP-1001 network module. For more detailed information on

using the network module, refer to the FP-1000/1001 user manual.

For information on the ASCII protocol used by the network

module, refer to the FP-1000/1001 programmer reference manual.

DIN Rail Mounting

NOTE: Terminal bases must be connected to the network

module before applying power to the module. Do not connect

or disconnect terminal bases while power is applied to the

network module.

FP1001.fm Page 1 Thursday, July 31, 1997 8:51 AM

The FP-1001 has a simple rail clip for mounting reliably onto a

standard 35 mm DIN rail. To install the FP-1001 to the DIN rail,

follow these steps:

1. With a flat bladed screwdriver, open the DIN rail clip to the

unlocked position as shown in Figure 1.

Figure 1. DIN Rail Clip

2. Hook the lip on the rear of the FP-1001 onto the top of a 35 mm

DIN rail and press the FP-1001 down onto the DIN rail as

shown in Figure 2.

Figure 2. Installing the Network Module onto a DIN Rail

3. Slide the FP-1001 to the desired position along the DIN rail.

After the FP-1001 is in position, lock it to the DIN rail by

pushing the rail clip in.

4. Add terminal bases to the DIN rail with their local bus

connectors firmly mated to the FP-1001 local bus connector.

The FP-1001 is shipped with a protective cover over the local

bus connector. Remove this protective cover, and place it over

the local bus connector of the last terminal base in the stack as

shown in Figure 3.

Rail Clip LockedRail Clip Unlocked

Press

DIN Rail

over

Local Bus

Connector

FP1001.fm Page 2 Thursday, July 31, 1997 8:51 AM

Figure 3. Installed Network Module

Network Connection

Connect the FP-1001 to a host computer, or to the RS-485 repeater

port of an FP-1000, using the 5 position Combicon screw terminal

adapterofthe RS-485 connector on the FP-1001. You may connect

up to 25 FP-1001 network modules to a single RS-485 port of a

host computer, or up to 24 FP-1001 network modules to the

RS-485 repeater port of an FP-1000. The pinout of the RS-485

connector is shown in Figure 4.

Figure 4. RS-485 Connector Pinout

The TX+ of the host port (or FP-1000 RS-485 repeater port) must

be connected to the RX+ of all of the FP-1001 modules, and the

TX- of the host port (or FP-1000 RS-485 repeater port) must be

connected to the RX- of all of the FP-1001 modules. This pair of

connections provides communication from the host computer to

the FP-1001 modules.

Protective

Cover

Local Bus Connectors

Firmly Mated

Rail Snap

Locked DIN

Rail

RX–

RX+

TX–

TX+

GND

12345

FP1001.fm Page 3 Thursday, July 31, 1997 8:51 AM

The RX+ of the host port (or FP-1000 RS-485 repeater port) must

be connected to the TX+ of all of the FP-1001 modules, and the

RX- of the host port (or FP-1000 RS-485 repeater port) must be

connected to the TX- of all of the FP-1001 modules. This pair of

connections provides communication to the host computer from

the FP-1001 modules.

These connections are shown in Figure 5.

Figure 5. Typical Signal Connections with One FP-1001 Connected to

Multiple FP-1001 Network Modules

Figure 5 also shows the use of 120 Ohm termination resistors. An

RS-485networkmustbeterminatedateachendof the network, but

not anywhere else. Termination resistors should be installed

between the RX pair and between the TX pair of the host RS-485

port and on the RS-485 port of the last FP-1001 on the network. A

pair of terminating resistors are provided with the network

modules. To install them, twist the resistor leads with the RS-485

signal wires and insert them into the RS-485 port terminals.

An RS-485 network also needs biasing resistors to protect the

devices on the network against noise during intervals when no

RS-485 drivers are transmitting on the network. The host

computer’s RS-485 interface normally has provisions for such

biasing resistors. You should use this biasing feature for better

reliability and noise immunity.

Setting the Address and Baud Rate

Figure 6 shows the 8-position switch on the FP-1001 network

module. Switches 1-5 set the network address, and switches 6-8 set

the baud rate. Every network module connected to one serial port

of the host computer must be given a unique address; however,

FP-1001 FP-1001 FP-1001

120Ω

120ΩFrom Host

Computer's RS-485

Transmit Output Pair (TX)

To Host

Computer's RS-485

Receive Input Pair (RX)

–

RX TX RX TX RX TX

Connect the TX outputs of the host computer to the RX inputs of the FP-1001,

and the RX inputs of the host computer to the TX outputs of the FP-1001.

FP1001.fm Page 4 Thursday, July 31, 1997 8:51 AM

moduleson different serial ports mayhavethesame address. Every

module on one serial port of a host computer must have the same

baud rate.

Figure 6. Address and Baud Rate Switch

Switches 1-5 set the network address of the FP-1001. The

addresses of the terminal bases connected to the network module

are automatically configured to be sequentially higher than the

network module’s address. For example, if the network module is

set to address 20, the I/O module in the terminal base immediately

connected the network module is at address 21, the next I/O

module is at address 22, and so on. A terminal base is assigned a

network address whether an I/O module is inserted into it or not.

Table 1 shows the possible switch positions and the corresponding

address of the FP-1001.

Table 1. Network Address Switch Settings

Switch

Positions 1-5 Network Module

Address (Decimal) Switch

Positions 1-5 Network Module

Address (Decimal)

0130

10 140

20 150

30 160

12345678

1234 5678

Address Baud

Rate

Switch Cover

(Removed)

12345678

12345678 12345678

FP1001.fm Page 5 Thursday, July 31, 1997 8:51 AM

Switches 6-8 set the baud rate of the FP-1001. Table 2 shows the

switch positions and the corresponding network baud rates.

40 170

50 180

60 190

70 200

80 210

90 220

100 230

110 240

120 Other Settings Not Allowed

Table 2. Baud Rate Switch Settings

Switch

Positions 6-8 Network Module

Baud Rate Switch

Positions 6-8 Network Module

Baud Rate

300 19200

1200 38400

2400 57600

9600 115200

Table 1. Network Address Switch Settings (Continued)

Switch

Positions 1-5 Network Module

Address (Decimal) Switch

Positions 1-5 Network Module

Address (Decimal)

12345678 12345678

12345678

12345678 12345678

12345678

12345678 12345678

FP1001.fm Page 6 Thursday, July 31, 1997 8:51 AM

Powering the FP-1001

NOTE: Terminal bases must be connected to the FP-1001,

and the baud rate switch must be set, before power is applied to

the FP-1001.

An 11-30 VDC power supply is required by each FieldPoint stack.

The network module filters and regulates this supplied power and

provides power for all the I/O modules in the stack. Therefore you

need not provide power separately to each FieldPoint I/O module

in the stack. If your field I/O device needs to be powered

separately, you can use the terminals provided on each terminal

base for such power supply connections.

The power connector is a 4-pin screw terminal connector whose

pinout is shown in Figure 7.

Figure 7. FP-1000 and FP-1001 Power Connector Pinout

The two terminals labeled V are internally connected on the

networkmodule, as are the two terminals labeled C. Power mustbe

applied to one V and C pair for operation of the FieldPoint system.

If you want to power your field I/O devices from the same power

supply, the second V and C pair provides a convenient means of

connecting power to the V and C terminals of a terminal base.

Figure 7 shows this optional connection.

Specifications

Network ports ...................................1 RS-485 port

Baud Rates........................................300, 1200, 2400, 9600,

19200, 38400, 57600,

115200 (switch selectable)

Communication parameters..............1 start bit, 8 data bits,

1 stop bit, No parity

–

To Adjacent Terminal Base

(Optional Connection)

11-30 VDC

FP1001.fm Page 7 Thursday, July 31, 1997 8:51 AM

RS-485 isolation ...............................2500 Vrms breakdown,

250 Vrms operational

Power Consumption..........................1 W + 1.15 * ∑(I/O module

power requirements)

Operating Temperature.....................-40 °C to +70 °C

Storage Temperature.........................-55 °C to + 100 °C

Relative Humidity.............................5% to 90% non-condensing

Weight...............................................240 g (8.4 oz.)

CE Mark Compliance

This product meets applicable EU directive(s) as follows:

Safety isolation ................................EN 61010 (double insulation

for 250 Vrms working

isolation, installation

category II)

EMC Directive

Immunity....................................EN 50082-1:1994

Emissions ..................................EN 55011:1991 Group I

Class A at 10 meters

Mechanical Dimensions

Figure 8 shows the mechanical dimensions of the FP-1001.

Figure 8. Mechanical Dimensions

4.31

[109.5]

3.58 [90.9]

4.19 [106.4]

FP1001.fm Page 8 Thursday, July 31, 1997 8:51 AM

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