M-system R3-NM4, Instruction Manual

Page: 5 / 8

R3-NM4
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
EM-8331 Rev.4 P. 5 / 8
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
02 Read Input Status X Status of digital inputs to the slave
03 Read Holding Registers X General purpose register within the slave
04 Read Input Registers X Collected data from the field by the slave
05 Force Single Coil X Digital output from the slave
06 Preset Single Register X General purpose register within the slave
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
16 Preset Multiple Registers X General purpose register within the slave
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
00 Return Query Data X Loop back test
01 Restart Comm. Option Reset the slave and clear all counters
02 Return Diagnostic Register Contents of the diagnostic data (2 bytes)
03 Change ASCII Input Delimiter Delimiter character of ASCII message
04 Force Listen Only Mode Force the slave into Listen Only Mode