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2. Operation Status When an Error Occurs
When an error occurs, the FP-M usually stops operating. However, regarding duplicated output errors, a backup
battery abnormality, and operation errors, you can continue operation by changing the system register settings.
1) Duplicated output error (total-check error)
• If the duplicated use of output is detected, the FP-M stops operating and the ERR. LED turns ON.
When you change system register 20 settings using the FP Programmer II or NPST-GR Software, duplicated output
is not regarded as an error and the FP-M continues to operate. In this case, the ERR. LED does not turn ON.
Duplicated output error: system register 20 (K1 or ENAB)
[FP Programmer II: K0 (stops operation), K1 (continues operation)]
[NPST-GR Ver. 3.1: DISA (stops operation), ENAB (continues operation)]
2) Battery error (self-diagnostic error)
• If the voltage of the backup battery lowers or if the backup battery disconnects, the ERR. LED turns ON.
Battery error: system register 4 (K1 or NO)
[FP Programmer II:
K0 (stops operation), K1 (continues operation)]
[NPST-GR Ver. 3.1: YES (stops operation), NO (continues operation)]
3) Operation error (self-diagnostic error)
• An operation error is one of the errors in the programmable controllers. These errors occur when an instruction
[one of high-level/some basic (e.g., ST =) instructions] is executed abnormally.
• When an operation error occurs, operation of the programmable controller stops. At the same time, operation error
flags R9007 and R9008 turn ON, the error address is stored in DT9017 and DT9018, the error code [K45 (H2D)] is
set at DT9000, and the ERR. LED lights.
However, when you change system register 26 settings using the FP Programmer II or NPST-GR Software (Ver. 3.1
or later), the FP-M continues to operate. In this case, even if the FP-M continues to operate, this is regarded as an
error and the ERR. LED stays ON.
Operation error: system register 26
[FP Programmer II: K0 (stops operation), K1 (continues operation)]
[NPST-GR Ver. 3.1: STOP (stops operation), STRT (continues operation)]
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6-1. Self-diagnostic Function
Summary of Contents for FP-M Hardware
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