Operation
EL2904 35Version: 3.2.2
Fig.16: 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:
max Comm Comm Actuator
ReactionTime WD WD RT= + +
with
max
2 *15 20 50ReactionTime ms ms ms= + =
5.2.6 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.
Manufacturer Type Comment
Beckhoff AX5801 TwinSAFE Drive option card: safe restart lock
Beckhoff AX2000 AS option safe restart lock
Siemens SIRIUS series S00
3RT1016-1BB42
Contactor
Telemecanique LP1K09 Contactor
The tests were carried out as function tests only. The information provided in the respective manufacturer
documentation remains valid.
Recommended protective circuits
We recommend R/C or diode-based protective circuits for these devices.
Varistor-based protective circuits should not be used.
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