M-system R7E-DC16A Instruction Manual page 5

MODBUS FUNCTION CODES & SUPPORTED CODES
■ Data and Control Functions
CODE NAME
01 Read Coil Status
02 Read Input Status
03 Read Holding Registers
04 Read Input Registers
05 Force Single Coil
06 Preset Single Registers
07 Read Exception Status
08 Diagnostics
09 Program 484
10 Poll 484
11 Fetch Comm. Event Counter
12 Fetch Comm. Event Log
13 Program Controller
14 Poll Controller
15 Force Multiple Coils
16 Preset Multiple Registers
17 Report Slave ID
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
■ Exception Codes
CODE NAME
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
04 Slave Device Failure
05 Acknowledge
06 Slave Device Busy
07 Negative Acknowledge
08 Memory Parity Error
■ Diagnostic Subfunctions
CODE NAME
01 Return Query Data
02 Restart Comm. Option
03 Change ASCII Input Delimiter
04 Force Listen Only Mode
SEN TRONIC
X Digital output from the slave (read/write)
X Status of digital inputs to the slave (read only)
X General purpose register within the slave (read/write)
X Collected data from the field by the slave (read only)
X Digital output from the slave (read/write)
X General purpose register within the slave (read/write)
X
X Fetch a status word and an event counter
A status word, an event counter, a message count and a field of event
X
bytes
X Digital output from the slave (read/write)
X General purpose register within the slave (read/write)
X Slave type / 'RUN' status
X Function code is not allowable for the slave
X Address is not available within the slave
X Data is not valid for the function
X Loop back test
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