Program Troubleshooting
Chapter 26
26-3
The bit monitor allows the status of all 16 bits of any data table word to be
displayed. Bit manipulation allows data table bits to be selectively
changed and is useful in setting initial conditions in the data of
word instructions.
Bit Monitor Function
The bit monitor can function when the processor is operating in any mode.
By pressing [Search] [5] [3] <word address>, the status of all 16 bits of
the desired word is displayed. While the cursor is in the status field, you
can use the [1] and [0] keys to change the addressed digit data/status
values.
The status of the 16 bits in the next highest or next lowest word address
can be displayed by pressing the [
→
] or [
←
] keys, respectively. Also, you
can use bit monitor to force or display the status of force conditions.
Bit Manipulation Function
Bit manipulation can function when the processor is operating in the
Program or Remote Program mode. When in Remote Test, or
Run/Program mode, the program can override the bit status in the next
scan.
Use [
→
] or [
←
] to cursor over to any bit. With the cursor on the desired
bit, you can change its status by pressing [1] and [0].
To terminate this function, press [Cancel] [Command].
ATTENTION: If you need to change the status of any data
table bit, be sure that the consequences of the change are
thoroughly understood. If not, unpredictable machine operation
could occur directly or indirectly as a result of changing the bit
status. Damage to equipment and/or injury to personnel
could result.
The contact histogram function displays the on or off history of a specific
data table bit. You can monitor this function on the 1770-T3 Industrial
Terminal. You can print it by a peripheral printer. If you use a peripheral
device, set the baud rate for channel C of the Industrial Terminal to the
baud rate of your printer.
Bit Monitor/Manipulation
Contact Histogram
