Delta AH500 - Page 182

Chapter 5 Basic Instructions
5-3
5.2 Basic Instructions
Instruction code Operand Function
LD/AND/OR
S
Loading contact A/Connecting
contact A in series/Connecting
contact A in parallel
Device
DX DY X Y M SM S T C HC D L PR
S
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Symbol:
LD S
：
Specified device Bit
AND
OR
Explanation:
1. The instruction LD applies to contact A which starts from the mother line or contact A which is
the start of a contact circuit. It functions to reserve the current contents, and store the contact
state which is acquired in the accumulative register.
2. The instruction AND is used to connect contact A in series. It functions to read the state of the
contact which is specified to be connected in series, and perform the AND operation with the
previous logical operation result. The final result is stored in the accumulative register.
3. The instruction OR is used to connect contact A in parallel. It functions to read the state of the
contact which is specified to be connected in parallel, and perform the OR operation with the
previous logical operation result. The final result is stored in the accumulative register.
Example:
1. Contact A of X0.0 is loaded, contact A of X0.1 is connected in series, contact A of X0.2 is
connected in parallel, and the coil Y0.0 is driven.
2. When both X0.0 and X0.1 are ON, or when X0.2 is ON, Y0.0 is ON.