Siemens SIMATIC FM 453, Manual

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FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
If MD20 = 0 is input, all monitoring functions are active.
Individual monitoring functions can be inactivated by entering 0 in the desig-
nated bit of MD20.
You can deactivate the error messages using the single function “parking
axis” (see Section 9.3.2).
Table 9-12 Error Diagnostics – Absolute Encoder
Diagnosis Cause Error Message
Voltage monitoring Encoder power failure Diagnostic interrupt, external channel error
(see Troubleshooting, 11-4)
Error in absolute encoder
S
Error in protocol for data transfer be-
tween absolute encoder and
FM 453
S
Cable break
Diagnostic interrupt, external channel error
(see Troubleshooting, 11-4)
!
Warning
Hardware monitoring functions should be skipped only for test purposes,
since positioning errors may destroy the machine.
When voltage monitoring is deactivated and the power supply to the encod-
ers or the FM is switched off, an immediate failure in absolute value signal-
ing can cause drive movements if:
S
an operating mode other than open-loop control is active
S
and follow-up mode is deactivated
S
and the servo enable is activated or not parameterized.
See Section 4.5.
Monitoring/Error
Diagnostics
Encoder
Connection
Description of Functions