7

Multiple Faults for the Same Circuit

The Remote I/O Scanner stores faults (up to 64) in time sequence, not reference sequence. To see whether there are additional faults on the same reference, use the F4 (nxt) key to go through the fault screens. Watch the reference identification on line 2 for the specific circuit you are interested in.

Returning to the Monitor Screen

Press F1 (mon) to return to the Monitor screen you started from.

For more information about diagnostics, see chapter 10.

Forcing/Unforcing I/O

Individual I/O points can be forced and unforced from the Hand±held Monitor (the HHM's circuit forcing capability must be enabled to use this function). ForcinganI/O point changes its state in the Remote I/O Scanner's EEPROM memory. If the circuit is an output, the physical state of the output also changes. If the circuit is an input, the forced input data is sent to the CPU. Once forced, a circuit retains the forced state or value if power is removed. The forced circuit ignores data from an attached input device, or output data from the CPU. The force can ONLY be removed from the Hand±held Monitor.

Display the circuit you want to force on the Monitor screen, following the instructions on the preceding page.

HHM Display

MNTR3 143#0.3 %I 33 STS 0

> ref force diag

Forcing a Discrete Circuit

aCircuit status

Press F3 (force) to force the circuit. For a discrete circuit, the HHM displays these key functions:

mon on off reles

Press F2 (on) or F3 (off) to force the discrete circuit. The forced state will appear on line 3 of the display; the underline shows that the circuit is forced. To release the force, press F4 (reles).

MNTR3 143#0.3 %I 33 STS 1

mon on off reles

a Circuit is forced

104

Series 90±70 Remote I/O Scanner User's Manual ± July 1992

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Image 107
GE GFK0579B user manual Forcing/Unforcing I/O, MNTR3 143#0.3 %I 33 STS Ref force diag, Mon on off reles

GFK0579B specifications

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