Actual Value Conditioning; Encoder Types - Siemens SINUMERIK 840D sl Function Manual

Basics regarding the safety functions integrated in the system/drive

6.4 Actual value conditioning

Programmable Logic (SPL) is tested to ensure that it is correctly functioning (refer to Chapter
"Forced checking procedure of SPL signals (Page 177)").
Duration of the interval
The test interval duration of max. 1 year may only be extended under the following conditions:
● In the time
●
This means that for the duration of the automatic mode (with the protective door closed and
interlocked), a fixed cycle is not strictly specified. After expiry of the time, the forced checking
procedure can be carried out before the protective door is opened the next time.
Note
If the crosswise data comparison identifies an error, then this results in a STOP response (see
Chapter "Safe Stops A-F (Page 112)").
6.4 Actual value conditioning
6.4.1

Encoder types

Basic types
The following basic encoder types can be used with a drive module to implement safety-related
operation:
1. Incremental encoder via Sensor Module and DRIVE-CLiQ with sinusoidal voltage signals
A and B (signal A is shifted with respect to B through 90°) and a reference signal R, e.g.
ERN 1387, LS 186, SIZAG2:
2. Absolute encoder via Sensor Module and DRIVE-CLiQ with EnDat interface and
incremental sinusoidal voltage signals A and B (signal A is shifted with respect to B through
90°), e.g.: EQN 1325, LC 181
3. Motor encoder (IMS) with integrated DRIVE-CLiQ interface, with the properties
corresponding to the 1. or 2.
4. Direct encoder (DMS, e.g. linear scale) with integrated DRIVE-CLiQ interface, with the
properties corresponding to 1. or 2.
84
WARNING
after the test interval has expired, no hazards for personnel may be allowed to
occur - they must be completely excluded (e.g. the protective door is closed and is also
interlocked)
After the test interval has expired, before a possible hazard to personnel (e.g. for a request
to open a protective door), a test stop or a forced checking procedure must be carried out
to absolutely ensure the availability of the switch-off signal paths and the safety-related
inputs/outputs.
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated