Omron G3PW - MANUAL 2 User Manual page 85

Communications Settings
Note
Connecting to a Serial
Communications
Unit/Board in a PLC
G3PW Settings
1,2,3...
PLC Settings
70
2. Set the Communications Main Setting Number parameter [P25] to any
number between 1 and 8. The G3PW with each communications unit num-
ber will receive the MV from the Temperature Controller channel specified
by the Communications Main Setting Number.
Communications Main Setting Number: Specific Settings
1) Communications frames for the MV for all channels are sent from the EJ1 to
the G3PW according to the unit numbers. User programming is not required.
Ch1 MV Ch2 MV
Ch1 MV Ch2 MV
TC2 EDU
Ch2
Ch1
Unit 1
G3PW
Heater
Note: The MV for communications unit number 1 will be received if
there are more than 9 communications unit numbers.
Communica- Communica-
tions Main tions Main
Setting Setting
Number: 1
Number: 2
Note Refer to the note on page 72 for information on the Communica-
tions Main Setting Numbers.
The EJ1 will automatically send the MV for the maximum number of G3PW
channels. User programming is not required.
The following settings are necessary to connect a PLC and G3PW Power
Controllers with serial communications. RS-485 is used for communications,
so up to 31 G3PW Power Controllers can be connected.
1. Set all of the Communications Main Setting Number parameters [P25] to 1.
2. Set the communications unit numbers to any values between 0 and 99. (A
maximum of 31 nodes can be connected.)
Use the CMND instruction in the ladder program to send input variables to the
G3PW Power Controllers. Use a variable type of C1/81 and an address of
0000 for the communications main setting (MV) for each G3PW communica-
tions unit number.
Communications frame for Unit 1
Communications frame for Unit 2
Ch1 MV Ch2 MV
Ch1 MV Ch2 MV
Unit 2
Unit 3
G3PW G3PW G3PW
Heater Heater Heater
Communica- Communica-
tions Main
tions Main
Setting Setting
Number: 2
Number: 1
Section 6-1
Communications frame for Unit 3
Communications frame for Unit 4
CompoWay/F (RS-485)
Unit 4
2) The G3PW with each communi-
cations unit number will receive
the MV from the Temperature
Controller channel specified by
the Communications Main Set-
ting Number.