Omron Sysmac CJ Series, Operation Manual

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Starting and Stopping Temperature Control Section 3-12
3-12 Starting and Stopping Temperature Control
3-12-1 Run/Stop Control
To start temperature control for a loop that has been stopped, turn OFF the
corresponding Stop Bit in the output area of the CIO Area words allocated to
the Temperature Control Unit. To stop temperature control for the loop, turn
ON the Stop Bit.
• The initial setting of the bits is OFF (running).
• There is a separate Stop Bit for each loop.
Starting Loop 1 and
Stopping Loop 2 To start control in loop 1 and stop control in loop 2, turn OFF the Loop 1 Stop
Bit (bit 06 of CIO word n+2) and turn ON the Loop 2 Stop Bit (bit 04 of CIO
word n+2).
3-13 Precautions for Operation
When the IOM Hold Bit is ON, consider the status of external loads because
the output bits will not be cleared when the PLC is switched to PROGRAM
mode from RUN or MONITOR mode.
!Caution It takes approximately 4 seconds for outputs from the Temperature Control
Unit (control outputs and heater burnout alarm output) to go ON after the PLC
is turned ON. This delay must be taken into account if the Temperature Con-
trol Unit is being incorporated in an external sequence circuit.
Bit CIO word
CIO n+2 CIO n+12
15 Loop 1 Save Bit Loop 3 Save Bit
14 Loop 2 Save Bit Loop 4 Save Bit
13 Loop 1 Change PID Constants
Bit Loop 3 Change PID Constants
Bit
12 Loop 2 Change PID Constants
Bit Loop 4 Change PID Constants
Bit
11 0 0
10 0 0
09 0 0
08 0 0
07 Loop 1 0 Loop 3 0
06 Stop Bit Stop Bit
05 Loop 2 0 Loop 4 0
04 Stop Bit Stop Bit
03 Loop 1 Stop AT Bit Loop 3 Stop AT Bit
02 Start AT Bit Start AT Bit
01 Loop 2 Stop AT Bit Loop 4 Stop AT Bit
00 Start AT Bit Start AT Bit