HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 129 of 189
Version: 50F
5.12 Configuration of the measurement sections
5.12.1 General description of the encoder configuration
The most important input variables for the module's monitoring functions are safe position,
speed and acceleration. These are generated from the sensor systems connected using two
channels. For PL e according to EN ISO 13849-1 an architecture corresponding to category 4,
i.e. continuous dual-channel acquisition with high diagnostic coverage is required. For all
single-channel portions (e.g. mechanical connection of the sensor/encoder with only one
shaft/fastening) justified fault exclusions according to EN ISO 13849-2 can be defined. For PL
d according to EN ISO 13849-1, reduced diagnostic coverage can be used. Taking into
account the permissible fault exclusions according to EN ISO 13849-2, in some circumstances
sensor systems with a simple layout (only speed monitoring) may be adequate.
On this topic see APPENDIX 1
Note:
Further configuration is described in the programming manual.
5.12.2 Sensor type
Absolute encoders and incremental measuring systems are possible as well as proximity
switches that generate a count pulse.
5.12.2.1 Absolute encoder
Data interface: Serial Synchronous Interface (SSI) with variable data length from 12 to
28 bits
Data format: Binary or Gray code
Physical layer: RS-422 compatible
SSI master operation:
Clock rate: 150kHz
SSI listener operation (slave operation):
Max. external clock rate: 200 KHz
1)
or 350 kHz
2)
.
Min. pulse pause time: 30 µsec
Max. pulse pause time: 1 ms
Diagnostics:
Supply voltage monitoring
Fixed values
5 V, 8 V, 10 V, 12 V,
20 V, 24 V
Monitoring differential level
on the input
+/- 20% +/-2% (measuring
tolerance)
Plausibility of speed versus
position
DP < 2 * V * T with
T = 8 ms
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