M-system R3-GM1 Instruction Manual page 4

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 Register
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 Registers
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
00 Return Query Data
01 Restart Comm. Option
02 Return Diagnostic Register
03 Change ASCII Input Delimiter
04 Force Listen Only Mode
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
Digital output from the slave
Status of digital inputs to the slave
General purpose register within the slave
Collected data from the field by the slave
Digital output from the slave
General purpose register within the slave
Fetch a status word and an event counter
A status word, an event counter, a message count and
a field of event bytes
Digital output from the slave
General purpose register within the slave
Slave type / 'RUN' status
Function code is not allowable for the slave
Address is not available within the slave
Data is not valid for the function
Loop back test
Reset the slave and clear all counters
Contents of the diagnostic data (2 bytes)
Delimiter character of ASCII message
Force the slave into Listen Only Mode
R3-GM1
EM-8463 Rev.5 P. 4 / 6