Tested El1904 Devices; Fig. 19 Worst Case Response Time - Beckhoff EL1904 Operating Instructions Manual

Fig. 19: Worst case response time
It is assumed that a signal change takes place at the sensor, and that this is passed to the input. A
communication error occurs just at the moment when the signal is to be passed to the communication
interface. This is detected by the logic once the watchdog time of the communication link has elapsed. This
information should then be passed on to the output, resulting in a further communication error. This fault is
detected at the output once the watchdog time has elapsed, resulting in shutdown.
This results in the following formula for the worst-case response time:
ReactionTime = WD +
max Comm
with
ReactionTime = 2 *15 ms +
max
5.2.6

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
SICK C4000
SICK S3000
Wenglor SG2-14ISO45C1
Leuze lumiflex ROBUST 42/43/44
Schmersal BNS250-11ZG
ifm GM701S
Keyence SL-V (with PNP cable set)
The tests were carried out as function tests only. The information provided in the respective manufacturer
documentation remains valid.
EL1904
WD + RT
Comm Actuator
20 ms = 50 ms
Version: 3.0.0
Comment
Safety light curtain
Safety laser scanner
Safety light grids
Safety light barriers
Safety switch
Inductive safety sensor
Safety light curtain
Operation
37