Allen-Bradley MicroLogix 1200 Reference Manual page 109

PTO Enable Hard Stop (EH)
Sub-Element Address
Description
EH - Enable Hard Stop PTO:0/EH
The PTO EH (Enable Hard Stop) bit is used to stop the PTO sub-system
immediately. Once the PTO sub-system starts a pulse sequence, the only
way to stop generating pulses is to set the enable hard stop bit. The
enable hard stop aborts any PTO sub-system operation (idle, normal, jog
continuous or jog pulse) and generates a PTO sub-system error. The EH
bit operates as follows:
• Set (1) - Instructs the PTO sub-system to stop generating pulses
immediately (output off = 0)
• Cleared (0) - Normal operation
PTO Enable Status (EN)
Sub-Element Address
Description
EN - Enable Status PTO:0/EN
(follows rung state)
The PTO EN (Enable Status) is controlled by the PTO sub-system. When
the rung preceding the PTO instruction is solved true, the PTO instruction
is enabled and the enable status bit is set. If the rung preceding the PTO
instruction transitions to a false state before the pulse sequence completes
its operation, the enable status bit resets (0). The EN bit operates as
follows:
• Set (1) - PTO is enabled
• Cleared (0) - PTO has completed, or the rung preceding the PTO is
false
PTO Output Frequency (OF)
Sub-Element Description Address Data
OF - Output Frequency (Hz)
The PTO OF (Output Frequency) variable defines the frequency of the
PTO output during the RUN phase of the pulse profile. This value is
typically determined by the type of device that is being driven, the
mechanics of the application, or the device/components being moved.
Data less than zero and greater than 20,000 generates a PTO error.
Data Format Range
bit 0 or 1
Data Format Range
bit 0 or 1
Range
Format
PTO:0.OF word (INT) 0 to 20,000 control
Using High-Speed Outputs 6-11
Type User Program
Access
control read/write
Type User Program
Access
status read only
Type User Program
Access
read/write
Publication 1762-RM001C-EN-P