1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

Knowledgebase Quick Starts 631The following ladder logic will need to be entered into File #2By toggling Bit B3/0 the PTO can be activated. Once running the PTOwill generate the number of pulses entered into the PTOX:0.TOP longword and then stop. To restart, toggle B3/0.General Information on the PTOOnce running the PTO will continue to generate pulses until all pulseshave been generated or the PTOX:0/EH (Enable Hard Stop) bit has beenactivated.Once the EH bit is set the instruction will generate a PTO error of 1 (hardstop detected). In order to clear this error the PTO instruction must bescanned on a false rung of logic, and the EH bit must be off.To change the Total Output Pulses Generated in a working program anew value can be moved into PTOX:0.TOP by using the MOV command.Important Note: Once the PTO has been initiated and is generatingpulses a new TOP value will not take effect until the PTO has eithercompleted generating pulses and has been restarted or has been HardStopped using PTOX:0/EH bit and been restarted.Publication 1766-RM001A-EN-P - October 2008