ABB Remote I/O RIO600 Installation And Commissioning Manual page 188

Section 7
Modbus TCP communication
180
Parameter name Range
Binary Output Write Allowed
- Not allowed
Analog Output Write Allowed
- Not allowed
Modbus slave in RIO600 communicates with one master and the IP address of the
Modbus master is configurable through PCM600.
• If a Modbus request comes from an unregistered master (the master's IP address
differs from the one configured in PCM600 or RIO600 has not been configured
with a zero IP address), RIO600 Modbus slave does not connect to the
unregistered master/client and the master/client status LED on WHMI remains
red.
• If a Modbus master's IP address is correct (the masters' IP address is identical
with the one configured in PCM600 or RIO600 has been configured with a zero
IP address), the Master status LED in WHMI turns green. However, the RIO600
Modbus slave still searches for the Slave ID in the Modbus master's request.
• If the slave ID is not identical with the one configured in PCM600, the RIO600
Modbus slave does not respond to the Modbus master's poll request even if it is
in connected state with the master.
For the RIO600 Modbus slave to respond to a master's request, the IP addresses of
both the master and the slave ID must be the same as configured in PCM600 or
RIO600 must be configured with a zero IP address (default IP address) and the slave
ID should be the same as configured in PCM600.
The moment the RIO600 slave is connected to a Modbus master, Connection timeout
parameter comes into consideration.
If the duration of inactivity between the RIO600 Modbus slave and the connected
Master reaches the connection timeout value configured through PCM600, the
RIO600 Modbus slave is disconnected from the master and the WHMI status LED
turns red. To establish further communication between RIO600 Modbus slave and
Modbus Master, the master has to reconnect to the RIO600 Modbus slave. For
RIO600 Modbus slave to communicate with Modbus Master, the Modbus operation
and TCP Client operation must be "ON".
• If the binary input read method is set to "Instantaneous", the RIO600 Modbus
slave responds with the instantaneous or real-time values for a Modbus poll that
requests the status of binary input channels of the DIM8 H or DIM8 L module and
Unit Default value Description
- Not allowed Binary output should be allowed to
be operated irrespective of the
GOOSE communication.
- - -
Not allowed Analog output should be allowed to
be operated irrespective of the
GOOSE communication.
- - -
Installation and Commissioning Manual
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RIO600