. A complete Parts List is available at www.MillerWelds.com
OM-265 363 Page 35
8-2. Connection To PLC
The automation interface uses an RJ45 connector to communicate MODBUS RTU over RS485.
. It is NOT an Ethernet connection!
The pin connections are as follows:
Table 8-4. Connector Pinout
Function RJ45 Pin Circuit
Digital Communication
4 D+
5 D−
8 Common
Shield Case Shield
8-3. Example Power Source Operation Using A PLC
1 To enable welding control from the Automation Interface, set the “Automation Enable” bit (0x2000) in the Command Flags register
(MODBUS Holding Register 101).
2 Set desired Weld Mode by writing MODBUS Holding Register 105 using look-up table 5-1.
3 Obtain Minimum and Maximum values by reading from Input Registers section 300 (See Table 8-8).
4 Set all relevant parameters (MODBUS Holding Registers 102-107) to their desired values. They must be within the minimum and maximum
values read in Step 2. Verify the values are correct by reading Input Registers 102-107.
5 Enable weld output by setting the Output Enable Flag to 1 in the Command Flags register (MODBUS Holding Register 101).
6 Voltage & Current Feedback values can be read from Input Registers section 200 (See Table 8-8).
7 Disable weld output by clearing the Output Enable Flag to 0 in the Command Flags register (MODBUS Holding Register 101).
Table 8-5. MODBUS Function Codes
Function Function Code
Read Input Register 4
Read Holding Register 3
Write Single Register 6
Write Multiple Register 16
Read/Write Multiple Register 23
Table 8-6. MODBUS Holding Registers
Register Address
Register Name Register Description
PDU MODBUS
100 101 Command Flags See Table 8-7.
101 102 Weld Voltage Command Voltage command in 0.1V (used for CV & CV+C).
102 103 Weld Current Command Current command in 1A (used for CC & CV+C).
103 104 Weld Wire Speed Wire speed in IPM (only an initial guess in CV+C).
104 105 Weld Mode See Table 8-10.
105 106 Run-In Speed Percentage Run-in wire speed percentage (%) of weld wire set-point
106 107 Burn Back Time Time in which power source is on, with wire stopped, in milliseconds.
107 108 Drive Roll Diameter Diameter in 0.001 in. Only used when RAD 100 is connected.
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