M-system R7E-DC16A, Instruction Manual

Page: 5 / 6

R7E-DC16A
P. 5 / 6 EM-7807-G Rev.4
MODBUS FUNCTION CODES & SUPPORTED CODES
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Data and Control Functions
CODE NAME
01 Read Coil Status X Digital output from the slave (read/write)
02 Read Input Status X Status of digital inputs to the slave (read only)
03 Read Holding Registers X General purpose register within the slave (read/write)
04 Read Input Registers X Collected data from the field by the slave (read only)
05 Force Single Coil X Digital output from the slave (read/write)
06 Preset Single Registers X General purpose register within the slave (read/write)
07 Read Exception Status
08 Diagnostics X
09 Program 484
10 Poll 484
11 Fetch Comm. Event Counter X Fetch a status word and an event counter
12 Fetch Comm. Event Log
X
A status word, an event counter, a message count and a field of event
bytes
13 Program Controller
14 Poll Controller
15 Force Multiple Coils X Digital output from the slave (read/write)
16 Preset Multiple Registers X General purpose register within the slave (read/write)
17 Report Slave ID X Slave type / ‘RUN’ status
18 Program 884/M84
19 Reset Comm. Link
20 Read General Reference
21 Write General Reference
22 Mask Write 4X Register
23 Read/Write 4X Register
24 Read FIFO Queue
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Exception Codes
CODE NAME
01 Illegal Function X Function code is not allowable for the slave
02 Illegal Data Address X Address is not available within the slave
03 Illegal Data Value X Data is not valid for the function
04 Slave Device Failure
05 Acknowledge
06 Slave Device Busy
07 Negative Acknowledge
08 Memory Parity Error
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Diagnostic Subfunctions
CODE NAME
01 Return Query Data X Loop back test
02 Restart Comm. Option
03 Change ASCII Input Delimiter
04 Force Listen Only Mode
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