Incremental Encoder FG 41
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2.5.1 Mandatory safety checks / measures
Measures for commissioning, changes
SCS error reaction
Check that the desired automation task is executed as required.
STOP
Check by the SCS
SCS error reaction
Check of incremental data according to the present automation
task and safety function.
STOP
Two-channel monitoring of incremental outputs for cable
breakage.
For tri-state state
-> STOP
Only for variant 1
Evaluation of the condition SIN(x)2 + COS(x)2 = 1. The number
of checks / revolution corresponds to the number of
periods/revolution: 1024, 2048 or 4096
For the safety functions SDI, SS1, SS2, SOS, SSR, SSM an
annulus monitoring with DC = 90 % is required.
For the SLS safety function a two-channel evaluation of the
frequency from (SIN/COS) with a DC of 90 % is required.
If outside tolerance
-> STOP
Only for variant 2
A cable break detection is required for the evaluation of the
square pulse signals.
In the safe state, the output drivers are in tri-state
(high-resistance state).
If a cable break is de-
tected
-> STOP
Only for variant 2
Evaluation of the incremental data in differential mode and verifi-
cation with respect to antivalence, quadrature and against phase
equivalence between channels A and B
If outside tolerance
-> STOP
