Beckhoff EL72 1-901 Series - Fig. 215 El72 X19014 BlockDiagram

Integrated safety
EL72x1-901x182 Version: 1.9
Parameters of the safe input and output terminals
EL1904
Parameter Value
Sensor test channel 1 active Yes
Sensor test channel 2 active Yes
Sensor test channel 3 active Yes
Sensor test channel 4 active Yes
Logic channel 1 and 2 Single Logic
Logic channel 3 and 4 Single Logic
EL2904
Parameter Value
Current measurement active No
Output test pulses active Yes
Block formation and safety loops
Safety function 1
Fig.215: EL72x1_9014_block_diagram
Calculation
PFH / MTTFd /B10d – values
Component Value
EL1904 – PFH 1.11E-09
EL2904 – PFH 1.25E-09
EL6900 – PFH 1.03E-09
EL72x1-9014 - PFH 0.00
S1 – B10d 1,000,000
S2 – B10d 2,000,000
Days of operation (dop) 230
Hours of operation / day (hop) 16
Cycle time (minutes) (Tcycle) 15 (4x per hour)
Lifetime (T1) 20years = 175200 hours
Diagnostic Coverage DC
Component Value
S1/S2 with testing/plausibility DCavg=99%
EL2904 with testing DCavg=99%