Publication 1763-RM001C-EN-P - October 2009
Using High-Speed Outputs
139
•
Set (1) - Instructs the PTO sub-system to stop generating pulses
immediately (output off = 0)
•
Cleared (0) - Normal operation
PTO Enable Status (EN)
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)
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. In
the MicroLogix 1100 Series A controller, the data less than zero or greater
than 20,000 generates a PTO error. However, in the MicroLogix 1100
Series B controller, the data less than zero or greater than 40,000
generates a PTO error.
Sub-Element
Description
Address
Data Format
Range
Type
User Program
Access
EN - Enable Status
(follows rung state)
PTO:0/EN
bit
0 or 1
status
read only
Sub-Element Description
Address
Data Format
Range
Type
User Program Access
Controller
Series
OF - Output Frequency (Hz)
PTO:0.OF
word (INT)
0 to 20,000
control
read/write
A
word (UINT)
0 to 40,000
B
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
