Festo CAMC-G-S3 Manual page 257

A Technical appendix
Error acceptance
Additional requirements for rotary encoders with position determination using a counter (encoder 1
or encoder 2)
Incorrect position value due to
faulty count
Additional requirements for linear encoders (encoder 1 or encoder 2)
Mounting of read head broken
Static offset of the material
measure (e.g. visual code strip)
Damaged material measure
(e.g. visual code strip)
Additional requirements for rotary encoders with computer interface (encoder 2)
Transmission error:
– repeat;
– loss;
– insertion;
– incorrect sequence;
– message falsification;
– delay
Further requirements for the analysis of SIL position encoders
Supply voltage monitoring of the
encoder
Compliance with the operating
and ambient conditions spe­
cified for the encoder
1) Sensitivity and DC in accordance with the parameterised fault limits; specification applies to factory setting
2) Limitation through DCAV of the module through DC of the basic unit
Tab. A.23 Combined encoder systems: Encoder 1: Resolver [X2A] or incremental encoder [X10], enco­
der 2: Other encoder [X2B] (analysis via basic unit)
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English
Fault Error detection by the
exclusion safety module
None Cross-comparison of the
position data
(Encoder 1 - encoder 2)
Not re­ Cross-comparison of the
quired! position data
(Encoder 1 - encoder 2)
None Cross-comparison of the
position data
(Encoder 1 - encoder 2)
None Separate generation of the
supply voltage for:
– resolver [X2A]
– SIN/COS encoder
[X2B]
– incremental encoder
[X10]
None Not present.
This must be ensured at
the encoder
Supplementary notes/
comments
DC 1 x "high"
(safety module)
+ 1 x "low"
2)
(basic unit)
DC 1 x "high"
(safety module)
+ 1 x "low"
2)
(basic unit)
DC 1 x "high"
(safety module)
+ 1 x "low"
2)
(basic unit)
–
The basic unit has an
input for monitoring
the motor temperat­
ure. In the case of er­
ror, the drive can be
switched off function­
ally
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