Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Knowledgebase Quick Starts 631
The following ladder logic will need to be entered into File #2
By toggling Bit B3/0 the PTO can be activated. Once running the PTO
will generate the number of pulses entered into the PTOX:0.TOP long
word and then stop. To restart, toggle B3/0.
General Information on the PTO
Once running the PTO will continue to generate pulses until all pulses
have been generated or the PTOX:0/EH (Enable Hard Stop) bit has been
activated.
Once the EH bit is set the instruction will generate a PTO error of 1 (hard
stop detected). In order to clear this error the PTO instruction must be
scanned on a false rung of logic, and the EH bit must be off.
To change the Total Output Pulses Generated in a working program a
new value can be moved into PTOX:0.TOP by using the MOV command.
Important Note:
Once the PTO has been initiated and is generating
pulses a new TOP value will not take effect until the PTO has either
completed generating pulses and has been restarted or has been Hard
Stopped using PTOX:0/EH bit and been restarted.
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes