EUCHNER MSC, Operating Instructions, Installation And Use

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2121331-04-04/19 (Translation of the original operating instructions)
Operating Instructions
Modular Safety Control System MSC
EN
9.3. Function blocks for speed monitoring
Important!
Ì An external fault or a malfunction on the encoder/proximity switch or on its connections does not
necessarily result in a change in the safety status on the normal output of the function block (e.g.
"zero"). Faults or malfunctions on the encoder/proximity switch or in the cabling are, however, de-
tected by the module and managed and specified via the diagnostics bit (error output (Error)) that
can be activated on each function block.
Ì To ensure safety, the diagnostics bit must be used in the configuration program to initiate possible
deactivation of the outputs if the axis is in operation. If there are no external problems on the en-
coder/proximity switch, the "Error" output is 0 (zero).
Ì If there are the following external problems on the encoder/proximity switch, the "Error" output is 1
(one):
-Encoder or proximity switch missing.
-One or more connections on the encoder or proximity switch missing.
-No encoder supply (only TTL model with external supply).
-Frequency discrepancy between the signals on the encoder/proximity switch.
-Phase error on the encoder signals or cycle error on an individual phase.
Figure 124: Example for the speed regulation function block with "Error Out" activated