System Manual ESM-F
7
Output modules with fixed and adjustable time-delay
On output modules with time-delay, the safety contacts are not opened immediately
after the stop signal from the base unit, but only after a time-delay has elapsed.
In this way parts of the system can continue to be supplied with power after an
emergency stop request, e.g. to move tools to a safe home position or to brake
parts of the system that run on (controlled stop, stop category 1 according to
EN 60204-1
).
Expanding time-delay output modules
If more than four time-delay contacts are required, it is possible to fit further stan-
dard output modules to the right of the switch-off delayed, output module; these
additional standard output modules are then switched at the same time as the
switch-off delayed, module.
Out
Out Out
Out Out
In
Base
Non-time-delay
Delay time
T1 (e.g. 10 s)
Delay time
T2 (e.g. 5 s)
Time-
delay
Time-
delay
Figure 16: Expansion of time-delay safety contacts
If several different time-delays are required, the system can be expanded with
further switch-off delayed, output modules. Each time-delay output module functions
independently of the adjacent time-delay modules. The following diagram shows
the sequence in which the outputs in the example above will switch.
t
0
T2
T1
Outputs
Enable
Non-time-delay
T1
T2
t (s)
= switched on
5 s)
10 s
Figure 17: Pulse diagram
