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4.0
MODBUS MEMORY MAP
4.1
General Description
This document provides the basic Modbus memory map and command structure for the WFD-3
RS-485 communications port. The WFD-3 supports the Modbus Protocol as specified in the
Modicon Technical publications "Modbus Protocol" (intr7.html). The WFD-3 control does not
support the Broadcast mode. The controller provides the slave side communications routines for
the RTU mode. The user must define the Slave ID to a unique ID number from 1 – 247. Default
Baud rate is 19.2 K baud - No Parity, One Stop bit. The default factory Device ID is set to 1. The
device ID can be modified by the user by modifying the Device ID register. Depending on the Device
ID range the following baud rate will be set. Device ID 1 – 31 the default baud rate is 19.2 K Baud,
Device ID 32 – 63 the Baud rate is 115.2 K Baud, Device ID 64 – 127 the baud rate is 57.6 K Baud.
Device ID 128 – 247 The Baud rate is 19.2 K Baud.
4.2
Supported Modbus Commands
The following ModBus commands are supported:
CODE
01
03
05
06
15
16
17
4.3
Memory Map for Coils (Modbus Command 01,05,15)
The following is the Coil definitions address 0-31:
COIL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DESCRIPTION
Read Coil Status
Read Holding Registers
Force Single Coil
Preset Single Register
Force Multiple Coils
Preset Multiple Registers
Report Slave ID
ADDRESS
0
INP1 – CW remote I/O input
1
INP2 – CCW Remote 1/0 Input
2
INP3 – Modbus CW Limit Switch Input
3
INP4 – Modbus CCW Limit Switch Input
4
Home Drive Input
5
Auto sequence Move to Position and Halt Input
6
Auto sequence Move Length and No Halt Input
7
Disable Remote I/O inputs
8
WFD-3 Ready Output (1=Ready, 0=Not Ready)
9
Motor Drive On ( 1= On)
10
Current Limit Output (1=Current Limit Active)
11
Auto Execute Complete (1= Auto Execute Complete)
12
Auto Routine Active (1 = Auto Execute Active)
13
Auto Execute Fault (1= Auto Execute Fault)
14
Save Default Configuration Input ( 1=Save)
15
Power Up Reset (1 = Power Up Reset has Occurred)
12
ADDRESS RANGE
0-15
0-19
0-15
0-19
0-15
0-19
5 bytes
DESCRIPTION
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