Safety Integrated - Industry - Siemens

Ex. -No.
4.3
Description Parameters
The external device monitoring circuit for a dependent, second OSSD
has the same function as the standard external device monitoring
circuit.
This circuit monitors the second channel, but does not have any
effect on the enabling of channel 1.
In this example, the magnet contact is monitored by the second
external device monitoring circuit.
The Monitored start - monitor input device requires activation of the
start input of the corresponding OSSD as an additional start requirement.
If the AND link of all the monitoring, linking and external device
monitoring circuit devices of an OSSD delivers an ON result, and if the
start requirements have been fulfilled, the Monitored start - monitor
input start device relays the enabling request to the output device.
After the first output circuit is switched off, the second output circuit
is switched on after the set delay time elapses. The delay time can
be set between 1 s and 300 s in 1 s increments. The second output
circuit must be switched off before the first output circuit is switched
on.
If the door is enabled, status ON, before the second output circuit is
switched on, the first output circuit is switched on again and the second
output circuit remains switched off.
Unlocking function
After the first output circuit is switched off via the door release and
the set delay time has elapsed (or via the standstill monitor), the second
output circuit switches on, so that in turn the doors are unlocked.
This type of unlocking is not always desired.
By activating the Unlocking device checkbox, a standard slave can
be specified whose status (LOCK signal) determines whether or not
the interlocking should remain after the delay time has elapsed.
When the machine is switched off, the LOCK signal enables the door
interlock to be switched on or off as desired.
94 Functional Example No. CD-FE-I-032-V10-EN