3 Basic Instructions Step ladder instructions Note 1: ES includes ES/EX/SS; SA includes SA/SX/SC; EH includes EH/EH2/SV. Note 2: For EH series MPU, the execution speed in the brackets ( ) refers to the execution speed of designated operand M1536 ~ M4095. 3.2 Explanations on Basic Instructions Explanations: contact circuit. The functions are to save the present contents and store the acquired contact status into the The LD instruction is used on the A contact that has its start from the left BUS or the A contact that is the start of a accumulative register. Program Example: Ladder diagram: Instruction code: Operation:
AND X1 Connecting to contact A of X1 in series Y1 OUT Y1 Driving Y1 coil Note: DVP-EH3 series PLCs whose version is 1.40 and DVP-SV2 series PLCs whose version is 1.20 support the operands X, Y, M, and S. These operands can be qualified by E or F, e.g. LD X0E1. Explanations: The LDI instruction is used on the B contact that has its start from the left BUS or the B contact that is the start of a contact circuit. The functions are to save the present contents and store the acquired contact status into the accumulative register.
DVP-PLC Application Manual 3-3 Instruction Execution speed (us) STEP Function Operands Code ES SA EH STL Step transition ladder start instruction S 11.6 10.6 0.56 1 RET Step transition ladder return instruction N/A 7.04 6.04 0.24 1 Mnemonic Function Program steps Controllers ES EX SS SA SX SC EH2 SV EH3 SV2 LD Loading in A contact 1 Controllers ES EX SS SA SX SC EH 2 SV EH 3 S V 2 X0 ~ X377 Y0 ~ Y377 M0 ~ M4095 S0 ~ S1023 T0 ~ T255 C0 ~ C255 D0 ~ D9999 Operand - X0 X LD X0 Loading in contact A of X0 Mnemonic Function Program steps Controllers ES EX SS SA SX SC EH2 SV EH3 SV2 LDI Loading in B contact 1 X0 ~ X377 Y0 ~ Y377 M0 ~ M4095 S0 ~ S1023 T0 ~ T255 C0 ~ C255 D0 ~ D9999 Operand - Controllers ES E X SS SA SX SC EH2 SV EH 3 SV2