Chapter 5 Basic Instructions 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.
5-13 Instruction code Operand Function PED/APED/OPED S , S 1 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 ● ● ● ● ● ● ● ● ● ● ● S 2 ● ● ● ● ● ● ● ● ● ● ●