Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 459)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
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Toggle Bit Value
You can toggle bit values (for both I/O and data table memory) using the bit toggle
function. Although the bit toggle feature is not a true force function, it can have a
similar use in testing your ladder logic. Conditions in the ladder program that write to
the output data table override the toggle function. This function acts on the data table
I/O image (see the diagrams under the I/O Forcing heading), and thus has no effect on
output addresses that are forced ON or OFF.
The bit toggle function is of little use on real I/O in run mode, because both inputs and
outputs are overwritten each program scan. (Toggling a bit is NOT the same as forcing
a bit.)
!
MicroLogix 1000 users: The controller will fault if you set an output bit ON (1) that
does not exist as an actual output point on the controller. See the information on
status bit S:0/8 in Appendix A - Programming Reference for Packaged Controllers in
the Instruction Set Reference for information on changing this response.
There are several ways to use the bit toggle function:
•
Through the I/O Module System Configuration screen.
•
By pressing [Shift-F5] on the Ladder Logic display while in Processor Emulation
Mode (or while online).
•
From the Custom Display screen. Refer to the section on Custom Display later in
this chapter.
•
From the Multipoint Monitor screen. Refer to the section on Multipoint
Monitoring in Chapter 4 - Data Table Addressing and Editing .
To use the bit toggle function from the I/O Module System Configuration screen:
1. From the top level of the ladder editor, press [F8] Display .
2. Press [F3] Mon i/o .