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Troubleshooting
Problem
Modbus card is not installed on the controller.
Controller does not have power.
Configuration jumper, J4, is not installed.
Wire between the RS232/485 converter
and Modbus card is not connected.
Trouble configuring
the Modbus card
Polarity connections are incorrect.
Wrong com port or baud rate.
RS232/485 converter is not connected to the PC.
Attempting to configure the Modbus Card to ASCII
Mode, No Parity, and 1 Stop Bit.
Controller does not have power.
Communicating with the wrong addressed slave.
Network wire connection from the Master to the
Modbus card is broken or the wire is not connect-
ed to the Modbus card.
Not using twisted pair wire to make
the network connection.
No communications
Configuration jumper, J4, is still installed.
between the Modbus
card and the Master
Proper polarity markings are not being followed.
device
Termination jumper, J6, is not installed
on the last slave in the chain.
Modbus card communication configuration
does not match the Master's.
Twisted pair wire length exceeds 4,000 ft.
RS485 multi-drop has more than 32 devices.
Controller network option not enabled.
Modbus card is not installed on controller.
All LED's on the
Controller does not have power.
LED module are off.
The Modbus card is damaged.
Holding Register or Coil address is beyond the
legal range. There are no Holding Registers above
address 40232 and no Coils above address 128.
Holding Register or Coil is Read Only.
Write Multiple Holding Register or Coil range
includes Read-Only registers.
The feature associated with the register being
Illegal Data Address
programmed is not enabled.
exception response
to a write query
Writing non-zero data to nonprogrammable date
registers for CDP Exercisers.
Writing CDP Exerciser registers with Write Single
Holding Register command, or Write Multiple
Holding Register command with invalid range.
Writing System Time registers with Write Single
Holding Register command, or Write Multiple
Holding Register command with invalid range.
Data value being written is too high or too low.
Illegal Data Value
exception response to
Data value would violate a minimum offset with
a write query
respect to another register.
Controller has recently restarted after a power failure and
has not initialized the Modbus Card with new data yet.
Slave Device Busy
exception response to
Modbus query
Controller is waiting for the In-Phase Monitor to
detect phase synchronization.
24
MX150/MX250 Series Modbus Network Card (71R-2200)
I
Possible Cause
Corrective Action
Install the Modbus card on the controller.
Apply power to controller.
Install the configuration jumper J4.
See Appendix D for the proper connections. Connect the
twisted pair wire between the converter and the Modbus card.
Make sure that A & B on the Modbus card are connected to A & B
on the converter, respectively.
Select the correct com port and baud rate. (Refer to Appendix D)
Connect the RS232/485 converter to the PC's serial port.
The combination of ASCII Mode, No Parity, and 1 Stop Bit is not sup-
ported. Select another communication setting.
Power up the controller.
Verify that the address on the Modbus card matches the address you
are communicating with. See Figure 2 for reference.
Check the wire connection from the Master to the Modbus card.
Connect the wire to the Network card if necessary.
Make sure interconnect cable is a twisted pair wire (Belden 8471,
16 AWG) (ABB Zenith Part # WMW-453).
Remove the J4 configuration jumper.
Make sure that A & B on the Modbus card are connected to A & B
on the converter, respectively.
Install termination jumper, J6, on the last slave in the chain.
Make sure no other devices have jumper J6 installed.
Verify that the Master and Modbus card have the same baud rate, data
bits, parity, stop bits with ASCII or RTU protocol selected.
Install repeater if wire length exceeds 4,000 ft.
Install one repeater for every 32 devices on the network.
Refer to Appendix H.
Install the Modbus card on controller.
Power up the controller.
Call ABB Zenith Technical Support.
Make sure the correct address is being sent
Select a Holding Register or Coil that can be written.
Break up the write request into sections that contain only
Read/Write registers.
Enable the feature in the User Configuration Menu on the controller
HMI (if applicable), or call ABB Zenith Technical Support.
Refer to the "Exerciser Time and Date Format" section of "Clock
Exercisers" for more information.
Refer to the "Writing the Clock Exerciser Holding Registers" section for
more operation information.
Refer to the "Writing the System Time Holding Registers" section of
"System Time" for more information.
Refer to Appendix B for maximum/minimum data ranges.
Refer to Appendix B for minimum data offsets.
Wait a few seconds for the controller to initialize
the Modbus Card with new data.
Refer to the "Operation with In-Phase Monitor" section of this manual
for more information.
ABB Zenith
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