Siemens SED2-MODBUS2 Owner's manual

Technical Instructions

Document No. 155-767

February 25, 2009

Modbus RTU Interface Module for SED2

Siemens Industry, Inc.

Description The Modbus RTU Interface Module for SED2 enables serial communication

between a Modbus RTU and a SED2 Variable Frequency Drive (VFD).

Product Part Number SED2-MODBUS2

Contents •MicroGate II Interface module.

•Local cable for USS communication with SED2.

•Network cable for ModBus communication with Building Automation

controller.

•Installation documentation.

Required Tools Personal computer for configuring device prior to operation.

Configuration Kit (SED2-MODBUS2_KIT), containing:

•External Power Supply for the MicroGate II.

•9-pin (female) to 9-pin (female) Serial Null Modem Cable.

•Installation documentation.

NOTE: Both the Interface Module and the SED2 must be configured prior to

operation.

Figure 1.

Technical Instructions Modbus RTU Interface Module for SED2

Document Number 155-767

February 25, 2009

Page 2 Siemens Industry, Inc.

Warning/Caution Notations

WARNING: Personal injury/loss of life may occur if you do not

perform a procedure as specified.

CAUTION:

Equipment damage, or loss of data may occur if

you do not follow procedure as specified

Hardware Setup

Power Supply

Power may be supplied by either connecting the configuration kit power supply to one side of

the unit, or by providing regulated 6 to 28 Vdc power to pin 9 of the local serial port from the

SED2. See Figure 2.

WARNING:

Do not connect the external 9 Vdc power supply and pin 9

of the LOCAL cable at the same time.

Programming Switch The Programming (PRG) Switch on the Interface Module, should always be in the RUN

position (up) for normal operations and configuration.

The PRG position is used strictly for loading firmware at the factory.

The Interface Module comes with two serial ports. See Figure 2.

The LOCAL port is for connection to a SED2 and supports both RS232 and RS485 (2-wire

and ground) communications. The LOCAL port is also used for configuration and

programming of the Interface Module.

The NETWORK port is for connection to a network and supports RS485 (2-wire)

communications.

Figure 2. Interface Module Hardware.

Modbus RTU Interface Module for SED2 Technical Instructions

Document Number 155-767

February 25, 2009

Siemens Industry, Inc. Page 3

Hardware Setup, Continued

Figure 3. Three Wire

Network Cable.

The Interface Module is provided with two cables.

A three wire cable (Figure 3) connects the NETWORK port to a network. Because the

network connection type may vary among different installations, the cable ends are

stripped wires to provide maximum flexibility.

Figure 4. RS485 Network Cable.

Figure 5. Four Wire

Local Port Cable.

A four wire cable (Figure 5) connects the LOCAL port on the Interface Module to an

SED2. The cable ends in stripped wires to facilitate a connection to the SED2 drive

terminals shown below.

CAUTION:

SED2 drive power should be off while connecting

the wires to the drive terminals.

Figure 6. SED2 Drive Cable.

Figure 7. Cables Installed on Interface Module.

Technical Instructions Modbus RTU Interface Module for SED2

Document Number 155-767

February 25, 2009

Page 4 Siemens Industry, Inc.

Hardware Setup,

Continued

LED Indicators

Figure 8.

There are a total of three bi-color LED indicators on the Interface Module. See

Figure 8. The NET LED displays communications activity on the Network (Modbus)

port.

•The STAT LED displays the overall status of the Interface Module.

•The LCL LED displays communications activity on the Local (SED2) port.

During normal operations, the NET and LCL LEDs will quickly alternate red and green

flashes, making it look almost amber; this is normal.

Table 1. Interface Module General Status LED (Stat).

For this state: LED is: To indicate:

No power Off No power applied to the device.

Run Mode Flashing Green

(250 ms On, 250 ms Off) Interface Module is operating

normally in RUN Mode.

Configuration Mode Flashing Green

(1.5 sec on, 1.5 sec Off) Interface Module is in

CONFIGURATION Mode.

Fatal Error Flashing Yellow

(250 ms On, 250 ms Off)

Interface Module has

experienced a fatal error, and

has halted communication.

NOTE: If the Interface Module has been installed correctly, the STAT LED will be

flashing green, and the LCL LED will be alternating so fast between red and

green that it will appear to be glowing amber.

Table 2. Network Communication Activity LED (NET).

For this state: LED is: To indicate:

Received Data Red Data from the Modbus Network.

Transmit Data Green Data onto the Modbus Network.

Table 3. SED2 Communications Activity LED (LCL).

For this state: LED is: To indicate:

Received Data Red Data from the SED2.

Transmit Data Green Data to the SED2.

Modbus RTU Interface Module for SED2 Technical Instructions

Document Number 155-767

February 25, 2009

Siemens Industry, Inc. Page 5

Hardware Setup

Continued

Default Configuration

Table 4. Configuration Options.

Parameter Options Default

Protocol

Interface Module ASCII

Interface Module RTU

Interface Module

RTU

Interface

Module ID

1… 254 2

Baud Rate

1200 bps

4800 bps

9600 bps

19200 bps

38400 bps

57600 bps

115200 bps

9600 bps

Data Bits

Parity

None

Even

Odd

Even

Stop Bits

Changing the

Configuration The configuration stored in the Interface Module may be changed from the default

configuration by entering CONFIGURATION Mode.

1. Attach a configuration cable between the LOCAL port and a serial port on a

computer.

2. Start a terminal program, such as HyperTerminal, on the computer, and connect

using the following setting:

•Baud = 9600 bps

•Data bits = 8

•Parity = None

•Stop bits = 1

•Flow control = None

3. With the Programming Switch set to RUN, apply power to the Interface Module,

and press the ENTER key within five seconds of startup. See Figure 9.

Technical Instructions Modbus RTU Interface Module for SED2

Document Number 155-767

February 25, 2009

Page 6 Siemens Industry, Inc.

Changing the

Configuration,

Continued

Once the Interface Module is in CONFIGURATION Mode, it will send its current

configuration to the terminal program.

Figure 9. MicroGate II Configuration Display.

Table 5. Keyboard Navigation.

Use the UP and DOWN arrows, on the computer

keyboard, to navigate to the field you want to change.

Change values with the LEFT and RIGHT arrows.

Save Configuration Navigate to here and press ENTER to save changes.

Modbus RTU Interface Module for SED2 Technical Instructions

Document Number 155-767

February 25, 2009

Siemens Industry, Inc. Page 7

SED2 Parameter

Configuration The Interface Module communicates with the SED2 VFD using the USS protocol

and the following parameter configuration:

•USS address set to 0

•USS baud rate set to 19.2K

•Parity set to Even

•Number of data bits set to 8

Configure SED2 VFD parameters to communicate with the MicroGate II, per Table 3.

Table 6. SED2 Parameter Settings to Communicate with the MicroGate II.

SED2

Parameter Function Setting/Value

P0003 User Access Level 3 (Expert Level)

P0700[0] Command Source 5 if Starting/Stopping VFD from Modbus;

otherwise, DO NOT change.

P1000[0] Frequency Setpoint

Source 5 if Setting the Frequency from Modbus;

otherwise, DO NOT change.

P2009[0] USS Normalization 0 (Disabled)

P2010[0] USS Baud Rate 7 (19.2K baud)

P2011[0] USS Address 0

P2014[0] USS telegram off time

0 to Disable the USS Watchdog timer.

100 or greater to enable the USS Watchdog

timer.

NOTE: Do not set to a value from 1 to 99.

P2041[0] Protocol Selection for

RS485 port 0 (USS Protocol)

Technical Instructions Modbus RTU Interface Module for SED2

Document Number 155-767

February 25, 2009

Page 8 Siemens Industry, Inc.

Watchdog Timer

Setup To enable an Interface Module Host Watchdog Function, the Interface Module Master

controls the first two holding Registers, WDOG TIME (40001) and WDOG ACTION

(40002).

When the Host Watchdog Function activates, the Interface Module does not receive any

further communications from the Master for a period of time determined by WDOG

TIME (40001). With WDOG ACTION (40002) set to 1, the SED2 stops on loss of

communications.

To activate the Interface Module Host Watchdog Function, set:

•WDOG TIME (40001) to the amount of time in milliseconds that must pass

with no further Interface Module communications.

•WDOG ACTION (40002) to 1so that the SED2 stops on loss of

communications with the Modbus master.

To deactivate the Interface Module Host Watchdog Function, set WDOG ACTION to 0.

SED2 Parameter 2014, USS Telegram Off Time, controls a Watchdog timer function for

the USS port.

•Once the Interface Module establishes communications with the SED2, if the

Interface Module stops communicating with the SED2, the SED2 automatically

enters the fault state with a F0070 fault number.

•Parameter P2014 specifies the timeout value for the USS Watchdog timer

function.

If P2014 is set to 0, the USS Watchdog timer is disabled. If P2014 is set to a non-zero

value, the USS Watchdog timer function is enabled and the timeout value is the P2014

non-zero value.

If using the USS Watchdog timer function with the Interface Module, set P2014 to a

value of 100 or greater so that accidental faults do not occur because of normal

communications delays between the Interface Module and the SED2.

Modbus RTU Interface Module for SED2 Technical Instructions

Document Number 155-767

February 25, 2009

Siemens Industry, Inc. Page 9

Verifying the

Installation

After all necessary connections have been made, power up the SED2 and the

Interface Module. Wait approximately five seconds.

NOTE: If the Interface Module has been installed correctly, the STAT LED will

be flashing green, and the LCL LED will be alternating so fast between

red and green that it will appear to be glowing amber.

Modbus Interface

Module with

Network as

Command Source

If not using the Modbus for commands, do not change P0700[0] and P1000[0].

Instead, verify communications by issuing a start command (from the source) and

checking the feedback on the Modbus master device to ensure that it reads proper

values in the appropriate Registers.

Modbus Interface

Module with

Network as

Command Source

1. To verify that the Interface Module and SED2 are set up correctly, set P0700[0]

and P1000[0] to a value of 5so that the SED2 can be controlled from the

Interface Module network.

2. From the Interface Module host, issue an Interface Module write, with of a value

of 8192 (2000h, or 50% of the maximum frequency) to the FREQ REF register

(40003 followed by a Modbus write with the value of 1 to the ENABLE register

(40004).

3. Write a value of 1 to the CMD START register to stop the drive again. The SED2

frequency can be changed at any time during this process by writing to the

FREQ REF register (40003).

Technical Instructions Modbus RTU Interface Module for SED2

Document Number 155-767

February 25, 2009

Page 10 Siemens Industry, Inc.

Interface Module

Registers

The following tables contain the lists of all Interface Module holding Registers available

on the Interface Module. The Interface Module host may write to Registers 40001

through 40023. All other Registers are read only.

There is a scaling factor included for some of the Registers. Because Modbus does not

represent floating point numbers, all floating point values in the drive are converted to

integer register values by applying a scaling (multiplication) factor. The scaling factors

are in the range of 10 to 1000.

For example: ACCEL TIME has a scaling factor of 100. If the SED2 contains a

value of 20.50, then the ACCEL TIME register will contain a value of 2050.

FREQ REF (40003) and FREQ ACTUAL (40063) are special case Registers. FREQ

REF contains the raw integer value passed in the HSW portion of a USS protocol

request to the SED2 drive. FREQ Actual contains the raw integer value passed in the

HIW portion of a USS protocol response from the SED2. Both Registers are scaled so

that a value of 4000th represents 100% of the actual frequency.

FREQ SCALED (40044) contains a scaled version of the HIW data, so that a value of

2000 in the register represents the value 4000h in the USS protocol response (and

100% of the maximum frequency).

STW and HSW refer to the 1st and 2nd control words, respectively, of PZD data

included in every poll sent from the Interface Module to the SED2 drive via the USS

protocol. ZSW and HIW refer to the 1st and 2nd status words, respectively, of PZD data

included in every poll response from the SED2 drive to the Interface Module via the USS

protocol. Registers mapped to PZD data are updated frequently.

All other parameters (except WDOG ACTION and WDOG TIME), which are handled

internally in the Interface Module, are mapped to parameters in the SED2 drive, and are

updated cyclically.

•Registers mapped to monitor parameters—

such as CURRENT or SPEED, whose values change automatically during

normal operation of the drive, without the intervention of an operator—are

updated at a rate of approximately once per second.

•Registers mapped to setup parameters—such as ACCEL TIME or FREQ

MAX, whose values typically change only via intervention by an operator—are

updated at a rate of approximately once every five seconds.

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