ABB REF 610 Technical Reference Manual page 76

REF 610
76
Feeder Protection Relay
Technical Reference Manual
The implementation of the Modbus protocol in REF 610 supports the following
functions:
Table 4.1.15.2-1 Supported application functions
Function code
01
02
03
04
05
06
08
15
16
23
Table 4.1.15.2-2 Supported diagnostic subfunctions
Code Name
00 Return query data The data in the query data field is returned (looped back) in
01 Restart
communication
option
04 Force listen only
mode
10 Clear counters and
diagnostic register
11 Return bus
message count
12 Return bus
communication
error count
13 Return bus
exception error
count
14 Return slave
message count
Function description
Read coil status
Reads the status of discrete outputs.
Read digital input status
Reads the status of discrete inputs.
Read holding registers
Reads the contents of output registers.
Read input registers
Reads the contents of input registers.
Force single coil
Sets the status of a discrete output.
Preset single register
Sets the value of a holding register.
Diagnostics
Checks the communication system between the master and
the slave.
Force multiple coils
Sets the status of multiple discrete outputs.
Preset multiple registers
Sets the value of multiple holding registers.
Read/write holding registers
Exchanges holding registers in one query.
Description
the response. The entire response is to be identical to the
query.
The slave's 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. However, if the port is in the listen only
mode, no response will be sent.
The slave is forced to enter the listen only mode for Modbus
communication.
All counters and the diagnostic register are cleared.
The number of messages in the communications system
detected by the slave since its last restart, clear counters
operation or power up is returned in the response.
The number of CRC errors encountered by the slave since its
last restart, clear counters operation or power up is returned in
the response.
The number of Modbus exception responses sent by the slave
since its last restart, clear counters operation or power up is
returned in the response.
The number of messages addressed to the slave or broadcast
which the slave has processed since its last restart, clear
counters operation or power up is returned in the response.
1MRS 755310