Omron SYSMAC CJ - REFERENCE MANUAL 08-2008

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Sequence Input Instructions Section 3-3
3-3-10 Operation Timing for I/O Instructions
The following chart shows the differences in the timing of instruction opera-
tions for a program configured from LD and OUT.
3-3-11 TR Bits
TR bits are used to temporarily retain the ON/OFF status of execution condi-
tions in a program when programming in mnemonic code. They are not used
when programming directly in ladder program form because the processing is
automatically executed by the Peripheral Device. The following diagram
shows a simple application using two TR bits.
↓
↑
!
!
!
!
!
!
!
!
!↓
!↑
!
↓
↑
!↓
!↑
I/O refreshin
g
Instruction execution
CPU
processing
Input
received
Input
received
Input
received
Input
received
Input
received
Input
received
Input
received
Input
received
Input
received
Input
received
Input received
Input
received