4 Step Ladder Instructions 6. Restrictions on diverging sequence: See 4.5 for example a) You can use maximum 8 diverged steps in a divergence sequence. b) You can use maximum 16 loops in multiple divergence sequences or in simultaneous sequences combined into one sequence. c) You can designate a step in the sequence to jump to any step in another sequence. 7. Reset of the step and the inhibiting output: a) Use ZRST instruction to reset a step to be Off. b) Make M1034 = On to inhibit output Y. 8. Latched step: The On/Off status of the latched step will be memorized when the power of the PLC is switched off.
When the PLC is re-powered, the status before the power-off will be recovered and the execution will resume. Please be aware of the area for the latched steps. 9. Special auxiliary relays and special registers: See 4.6refer to chapter 4.6 IST instruction for more details. DVP-PLC Application Manual 4-10 Device No. Function M1040 Disabling step. Disabling all the shifting of steps when On. M1041 Starting step. Flag for IST instruction. M1042 Enabling pulses. Flag for IST instruction. M1043 Zero return completed. Flag for IST instruction. M1044 Zero point condition. Flag for IST instruction. M1045 Disabling all output reset. Flag for IST instruction. M1046 Setting STL status as On.
On when any of the steps is On. M1047 Enabling STL monitoring D1040 On status of step No. 1 D1041 On status of step No. 2 D1042 On status of step No. 3 D1043 On status of step No. 4 D1044 On status of step No. 5 D1045 On status of step No. 6 D1046 On status of step No. 7 D1047 On status of step No. 8