Chapter 5 Basic Instructions Symbol: LDP S ： Specified device Bit ANDP ORP Explanation: 1. The instruction LDP functions to reserve the current contents, and store the rising-edge detection of the contact in the accumulative register. 2. The instruction ANDP is used to connect the rising-edge detection of the contact in series. 3. The instruction ORP is used to connect the rising-edge detection of the contact in parallel. 4. Only when LDP/ANDP/ORP is scanned can the state of the device be gotten, and not until LDP/ANDP/ORP is scanned next time can whether the state of the device changes be judged. 5. Please use the instructions PED, APED, and OPED in the subroutine. 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. 5-11 Instruction code Operand Function LDP/ANDP/ORP S 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 ● ● ● ● ● ● ● ● ● ● ● ●