Chapter 9
194
Logic programming – Function blocks
9.9.6
Light curtain monitoring
Function block diagram
General description
The Light curtain monitoring function block allows the implementation of a
semiconductor protective device functionality with ESPE.
The internal logic of the Light curtain monitoring function block corresponds to the
functionality of the Emergency stop function block, however with a limited parameter
selection. The single-channel input type cannot be selected in the Light curtain
monitoring function block. When the evaluation of the complementary inputs is High,
the
Enable
output is High (see Section 9.9.2).
If a corresponding dual-channel input element is configured in the hardware
configuration of the Setting and Monitoring Tool, this function block is no longer
required in the logic since the pre-evaluation is then carried out directly on the safety
I/O module (e.g. WS0-XTDI or WS0-XTIO module). But if the
Fault present
output is
required for further processing, the function block can be used to this purpose. To this
purpose the two input signals have to be configured as single-channel signals and
applied to the inputs of the function block.
Parameters of the function block
Parameter
Possible values
Inputs Dual-channel
equivalent
Discrepancy time
0 = disabled, 10 to 500 ms in 10 ms steps. If enabled, the value has
to be greater than the logic execution time.
Number of outputs
1 (Enable output)
2 (Enable output and Discrepancy error output)
Use fault present
With
Without
Figure 181:
Function block diagram for
the Light curtain monitoring
function block
Note
Table 85:
Parameters of the Light
curtain monitoring function
block
Summary of Contents for SW1DNN-WS0ADR-B
Page 2: ......
Page 288: ...Chapter 15 285 Annex ...
Page 289: ...Chapter 15 286 Annex ...
Page 290: ...Chapter 15 287 Annex ...
Page 291: ...Chapter 15 288 Annex ...
Page 292: ...Chapter 15 289 Annex ...
Page 293: ...Chapter 15 290 Annex ...
Page 294: ...Chapter 15 291 Annex ...
Page 295: ...Chapter 15 292 Annex ...
Page 296: ...Chapter 15 293 Annex ...
Page 297: ...Chapter 15 294 Annex ...
Page 298: ...Chapter 15 295 Annex 15 1 2 Example application Wood scanner ...
Page 299: ...Chapter 15 296 Annex ...
Page 300: ...Chapter 15 297 Annex ...
Page 301: ...Chapter 15 298 Annex ...
Page 302: ...Chapter 15 299 Annex ...
Page 303: ...Chapter 15 300 Annex ...
Page 304: ...Chapter 15 301 Annex ...
Page 305: ...Chapter 15 302 Annex ...
Page 306: ...Chapter 15 303 Annex ...
Page 307: ...Chapter 15 304 Annex 15 1 3 Example application Ramp down detection ...
Page 308: ...Chapter 15 305 Annex ...
Page 309: ...Chapter 15 306 Annex ...
Page 310: ...Chapter 15 307 Annex ...
Page 311: ...Chapter 15 308 Annex ...
Page 312: ...Chapter 15 309 Annex ...
Page 313: ...Chapter 15 310 Annex ...
Page 314: ...Chapter 15 311 Annex ...
Page 321: ......