User's Manual

R3-NMW1F
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8286 P. 7 / 10
MODBUS FUNCTION CODES & SUPPORTED CODES
■ 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 Register X General purpose register within the slave (read/write)
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 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
■ 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