9 Application Instructions API 150-199 API 163 Operands: S 1 : Time minuend S 2 : Time subtrahend D : Time remainder Explanations: 1. S 1 , S 2 , and D will occupy 3 consecutive devices. 2. See the specifications of each model for their range of use. 3. Flags: M1020 (zero flag); M1021 (borrow flag) 4. S 1 − S 2 = D . The hour, minute, and second of the RTC designated in S 1 minus the hour, minute, and second designated in S 2 . The result is stored in the hour, minute, and second of the register designated in D . 5. If S 1 and S 2 exceed their ranges, the program will regard this as an operation error and the instruction will not be executed.
M1067 and M1068 will be On and D1067 record the error code 0E1A (hex). 6. If the remainder is a negative value, the borrow flag M1021 will be On. The value in D will be the result of “the negative value pluses 24 hours”. 7. If the remainder equals 0 (00:00:00), the zero flag M1020 will be On. Program Example: 1. When X10= On, TADD instruction will be executed and the hour, minute and second in RTC designated in D0 ~ D2 will minus the hour, minute and second in RTC designated in D10 ~ D12. The remainder is stored in the hour, minute and second of the register designated in D20 ~ D22. X10 20 57 49 20 14 30 8 5 20:20:05 14:30:08 05:49:57 5 2.
If the subtraction result is a negative value, M1021 will be On. X10 19 11 15 15 9 20 5 10 30 05:20:30 19:11:15 10:09:15 DVP-PLC Application Manual 9-71 Mnemonic Operands Function TSUB P Time Subtraction Type OP Bit Devices Word Devices Program Steps X Y M S K H KnX KnY KnM KnS T C D E F TSUB, TSUBP: 7 steps S 1 * * * S 2 * * * D * * * PULSE 16-bit 32-bit EH3 SV2 ES EX SS EH3 ES EX SS SA SX SC EH SV EH3 SV2 ES EX SS SA SX SC EH SV SA SX SC EH SV SV2 TSUB D0 D10 D20 TSUB D0 D10 D20