Controller Connections
Instruction Manual
147
takes care of all the protocol’s overhead and handshaking requirements.
The Expert Alpha controller supports the following public Modbus function codes:
01 (0x01) Read Coils
02 (0x02) Read Discsreet Inputs
03 (0x03) Read Holding Registers
04 (0x04) Read Input Registers
05 (0x05) Write Single Coil
06 (0x06) Write Single Register
15 (0x0F) Write Multiple Coils
16 (0x10) Write Multiple Registers
Please visit http://Modbus.org for more information about the Modbus fieldbus.
Use the following table to correlate the external PLC addressing to the controller’s inputs and outputs.
Memory Type
Controller I/O
Type
External PLC
Address
Data
Type
External PLC
Read/ Write
“1” Coil
Input
10001 - 20256
Bit
Read/ Write
“2” Input
Output
20001 - 20256
Bit(s)
Read
"3" Holding Register
Input
30001 - 30256
Mixed Read/ Write
"4" Input Register
Output
40001 - 40256
Mixed Read
“5” Force Single Coil
Input
50001 - 50256
Bit
Read/ Write
"6" Single Register
Input
60001 - 60256
Mixed Read/ Write
“15” Force Multiple Coils
Input
0F0001 - 0F0256
Bit(s)
Read/ Write
"16" Multiple Register
Input
100001 - 100256
Mixed Read/ Write
For Mixed Data Type the type of data depends on the user assigned input and output functions.
It is important to understand that the coils and registers use the same memory.
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