Beckhoff EL6900, Operating Instructions Manual

Page: 28 / 62

Operation
EL6900 28 Version: 2.2.0
Fig. 14: Worst-case reaction time
This assumes that a signal change occurs at the sensor and is transmitted to the input. A communication
error occurs at precisely the moment when the signal is to be transferred to the communication interface.
This is detected by the logic following the watchdog time of the communication link. This information should
then be transferred to the output, but a further communication error occurs here. This error is detected at the
output following the expiry of the watchdog time and leads to the switch-off.
This results in the following equation for the worst-case reaction:
with, for example
4.2.6 Tested EL1904 devices
The following list contains devices that were tested together with the EL1904 TwinSAFE terminal. The
results only apply for the current device hardware version at the time of testing. The tests were carried out in
a laboratory environment. Modifications of these products cannot be considered here. If you are unsure
please test the hardware together with the TwinSAFE terminal.
Manufacturer Type Comment
SICK C4000 Safety light curtain
SICK S3000 Safety laser scanner
Wenglor SG2-14ISO45C1 Safety light grids
Leuze lumiflex ROBUST 42/43/44 Safety light barriers
Schmersal BNS250-11ZG Safety switch
ifm GM701S Inductive safety sensor
Keyence SL-V (with PNP cable set) Safety light curtain
The tests were carried out as function tests only. The information provided in the respective manufacturer
documentation remains valid.
4.2.7 Tested EL2904 devices
The following list contains devices that were tested together with the EL2904 TwinSAFE terminal. The
results only apply for the current device hardware version at the time of testing. The tests were carried out in
a laboratory environment. Modifications of these products cannot be considered here. If you are unsure
please test the hardware together with the TwinSAFE terminal.