Delta AH500 - Page 192

Chapter 5 Basic Instructions
5-13
Instruction code Operand Function
PED/APED/OPED
S
1
, S
2
Starting the rising-edge
detection/Connecting the rising
edge-detection in series/Connecting the
rising-edge detection in parallel
Device
DX DY X Y M SM S T C HC D L PR
S
1
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S
2
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Symbol:
PED
S
1
：
Specified device Bit
APED
S
2
：
For internal use Bit
OPED
Explanation:
1. PED/APED/OPED corresponds to LDP/ANDP/ORP. The only difference between
PED/APED/OPED and LDP/ANDP/ORP lies in the fact that users need to specify the bit
device S
2
in which the previous state of the contact is stored when PED/APED/OPED is
executed. Please do not use the device S
2
repeatedly in the program. Otherwise, the wrong
execution result will appear.
2. The instruction APED is used to connect the rising-edge detection of the contact in series.
3. The instruction OPED is used to connect the rising-edge detection of the contact in parallel.
4. Only when PED/APED/OPED is scanned can the state of the device be gotten, and not until
PED/APED/OPED is scanned next time can whether the state of the device changes be
judged.
5. PED/APED/OPED only can be used in the function block.
Example:
1. The rising-edge detection of X0.0 starts, the rising-edge detection of X0.1 is connected in
series, the rising-edge detection of X0.2 is connected in parallel, and the coil Y0.0 is driven.
2. When both X0.0 and X0.1 are switched from OFF to ON, or when X0.2 is switched from OFF
to ON, Y0.0 is ON for a scan cycle.