ABB 620 Series ANSI, Manual

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Section 3
1MAC052634-MB D
Vendor-specific implementation
14 615/620 series ANSI
Communication Protocol Manual
Table 5: Common (instance independent) Modbus TCP/IP diagnostic counters
3.2 Supported function codes
3.2.1 Application functions
Table 6: Supported application functions
3.2.2 Diagnostic functions
The diagnostic functions are only intended for serial communication. However, the serial
diagnostic counters can be read, but not reset, via the Modbus TCP/IP interface. The serial
line cannot be forced to the listen mode via the Modbus TCP/IP interface.
Table 7: Supported diagnostic subfunctions
Counter Description
CnReject No
sockets
The amount of connection requests that are rejected due to unavailable TCP sockets.
CnReject Not reg The amount of connection requests that are rejected since the client is not registered.
Function
code
Name Description
01 Read coil status Reads the status of discrete outputs.
02 Read digital input status Reads the status of discrete inputs.
03 Read holding registers Reads the contents of output registers.
04 Read input registers Reads the contents of input registers.
05 Force single coil Sets the status of a discrete output.
06 Preset single register Sets the value of a holding register.
08 Diagnostics Checks the communication system between
the master and the slave.
15 Force multiple coils Sets the status of multiple discrete outputs.
16 Preset multiple registers Sets the value of multiple holding registers.
23 Read/write holding registers Exchanges holding registers in one query.
Function
code
Name Description
00 Return query data The data in the query data field is returned
(looped back) in the response. The entire
response is identical to the query.
01 Restart communication option The slaves peripheral port is initialized and
restarted and the communication event
counters are cleared. Before this, a normal
response will be sent provided that the port
is not in the listen only mode. If the port is in
the listen only mode, no response will be
sent.
04 Force listen only mode The slave is forced to enter the listen only
mode for Modbus communication.
10 Clear counters and diagnostic register All counters and the diagnostic register are
cleared.