Omron CJ2 CPU UNIT SOFTWARE User Manual page 75

Output Status from Basic Output Units in PROGRAM Mode
Outputs from Basic Output Units will be refreshed with the I/O memory output bit status even in PRO-
GRAM mode. Therefore, the status will be output from the Basic Output Units when the output bits in
I/O memory are changed using the CX-Programmer or other Support Software.
The CPU Unit refreshes I/O even when the program is stopped (i.e., even in PROGRAM mode). Con-
firm safety thoroughly in advance before changing the status of any part of memory allocated to Basic
I/O Units, Special I/O Units, or CPU Bus Units. Any changes to the data allocated to any Unit may
result in unexpected operation of the loads connected to the Unit. Any of the following operation may
result in changes to memory status.
• Transferring I/O memory data to the CPU Unit from a Programming Device
• Changing present values in memory from a Programming Device
• Force-setting/-resetting bits from a Programming Device
• Transferring I/O memory files from a Memory Card or EM file memory to the CPU Unit
• Transferring I/O memory from a host computer or from another PLC on a network
To be sure that the outputs from the Basic Output Units remain OFF, turn ON the Output OFF Bit
(A500.15). (See note.) The INH indicator on the front of the CPU Unit will be lit when all outputs are
OFF (i.e., when the Output OFF Bit is ON).
Note The status of the Output OFF Bit (A500.15) is held when the operating mode is changed and the power is
turned OFF and ON, i.e., the outputs will remain OFF.
CJ2 CPU Unit Software User's Manual
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3 CPU Unit Operation
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