Publication 1766-RM001A-EN-P - October 2008
150
Using High-Speed Outputs
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
PTOX Output Frequency (OF)
The PTOX 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 1400 controller, the data less than zero or greater than
100,000 generates a PTOX error.
PTOX Operating Frequency Status (OFS)
The PTOX OFS (Output Frequency Status) is generated by the PTO
sub-system and can be used in the control program to monitor the actual
frequency being produced by the PTO sub-system.
Sub-Element Description
Address
Data Format
Range
Type
User Program Access
OF - Output Frequency (Hz)
PTOX:0.OF long word
(32-bit INT)
0…100,000 control
read/write
Sub-Element Description
Address
Data Format Range
Type
User Program Access
OFS - Operating Frequency Status (Hz)
PTOX:0.OF
S
long word
(32-bit INT)
0…100,000 status read
only
TIP
The value displayed may not exactly match the value entered in the
PTOX:0.OF. This is because the PTO sub-system may not be capable of
reproducing an exact frequency at some of the higher frequencies. For PTO
applications, this is typically not an issue because, in all cases, an exact
number of pulses are produced.
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive