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Use the Right cursor key to scroll through the PLC parameters until the Configured
Constant Sweep Setting (CFG CONS TM) parameter is displayed. To set the sweep time,
enter a value between 5 and 200 milliseconds, and press the ENT key. The default
setting is 100 milliseconds.
I/O Scan in Stop Mode Parameter
By default, the PLC will not scan I/O in stop mode. Enabling this parameter, however,
allows you to debug and test input and output wiring without a control program
installed.
Use the Right cursor key to scroll through the PLC parameters until the I/O scan in stop
mode (STOP MD) parameter is displayed. Then, use the –/+ key to toggle the selection
between NO I/O and DO I/O.
Dual Use Checking Parameter
The dual use checking parameter allows you to select whether or not %M and %Q
references should be restricted to single use as outputs within the user logic program.
When enabled, the system will not allow you to assign the same reference to two
different coils.
Note
This feature is not editable in a Model 351 CPU, since this parameter
applies to the user program, not the configuration.
Use the Right cursor key to scroll through the PLC parameters until the dual use
checking (COIL US) parameter is displayed. Then, use the –/+ key to toggle between
SINGLE, WRN MUL, and MULT. By default, WRN MUL is enabled. When toggling
from MULT to SINGLE or WRN MUL, the program is checked for multiple coil usage. If
multiple coils are detected, you can go to program mode and find the multiple coil usage
with the SRCH, #, –1 key sequence. When going to SINGLE, the transition is not
allowed; when going to WRN MUL, the transition is allowed. SINGLE check prevents
using the same %M or %Q coil reference in two or more locations in the program. WRN
MUL allows multiple coil uses of the same %M or %Q reference, but provides a warning
screen to the user that this is being done, and MULT allows multiple coil usage without a
warning.
Note
When an instruction is added and the coil use warning message is
displayed, the warning message should be verified with the search
function. It is possible that the use warning message is displayed even
though the coil is used only once in the program.
The PLC parameters described on the following pages are controlled by the Hand-Held
Programmer, but do not affect its operation. They are used for communications through
the power supply port with devices other than the HHP.
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Hand-Held Programmer for Series 90-30/20/Micro Programmable Controllers User’s Manual – February 1996
GFK-0402G