M-system R7M-DAC16C Instruction Manual page 7

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
08 Diagnostics
11 Fetch Comm. Event Counter
12 Fetch Comm. Event Log
15 Force Multiple Coils
16 Preset Multiple Registers
17 Report Slave ID
■ Exception Codes
CODE NAME
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
■ Diagnostic Subfunctions
CODE NAME
00 Return Query Data
MODBUS I/O ASSIGNMENT
ADDRESS
Coil (0X)
17 – 32
Inputs (1X)
17 – 32
33 – 48
49 – 64
65 – 80
Input Registers (3X)
17 – 24
25 – 48
Holding Registers (4X)
17 – 20
21 – 48
I: Integer, -1500 – +11500 (-15 – +115%)
F: Floating
Note: DO NOT access addresses other than mentioned above. Such access may cause problems such as inadequate operation.
Digital output from the slave (read/write)
Status of digital inputs to the slave (read only)
General purpose register within the slave (read/write)
Collected data from the field by the slave (read only)
Digital output from the slave (read/write)
General purpose register within the slave (read/write)
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 (read/write)
General purpose register within the slave (read/write)
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
DATA TYPE DATA
1 – 16 Digital Output (discrete output of the basic module)
Digital Output (discrete output of the extension module)
1 – 16 Digital Input (discrete input of the basic module)
Digital Input (discrete input of the extension module)
Reserved (unused)
Module Status
Reserved (unused)
1 – 4 I Analog Input
5 – 16 ---- Reserved (unused)
F Analog Input
---- Reserved (unused)
1 – 2 I Analog Output
3 – 16 ---- Reserved (unused)
F Analog Output
---- Reserved (unused)
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
R7M-DAC16C
EM-7803-AK Rev.4 P. 7 / 8