135
2121331-04-04/19 (Translation of the original operating instructions)
Operating Instructions
Modular Safety Control System MSC
EN
9.4.3. Guard lock logic (GUARD LOCK) (max. number = 4)
9.4.3.1. GUARD LOCK
Using the GUARD LOCK operator the locking/release of an ELEC-
TROMECHANICAL GUARD LOCK is monitored. For this purpose it is
checked whether the locking command and the status of an INTER-
LOCK and FEEDBACK match. The main output (OUTPUT) is "1" (TRUE)
if the guard lock is closed and locked.
Figure 156: Guard lock logic
Principle of operation:
The function operates as guard locking monitoring.
1. The GATE input must always be connected to a interlock input of type interlock (INTERLOCK) (feedback from the door).
2. The Lock_fbk input must always be connected to an input element of type guard locking monitoring (LOCK FEEDBACK)
(feedback from the locking element).
3. The UnLock_cmd input can be connected as required in the diagram and represents the unlock request (if logical "1").
4. The OUTPUT output on this element is "1" (TRUE), if the guard lock is closed and locked. If there is an unlock command
present on the UnLock_cmd input, the OUTPUT signal is set to "0" and the locking (Lock-Out output signal) is removed
after the time set in Unlock Time (s). The OUTPUT signal is set to "0" ("FALSE") if an erroneous state is present (e.g. door
open when locked; feedback loop timeout elapsed; ...).
5. The Lock-Out signal controls the locking of the safety door.
Parameter
Manual Reset: There are two types of reset: Manual and Monitored. On the selection of the manual reset, only the signal
transition from 0 to 1 is checked. With the monitored reset the double transition from 0 to 1 and then back to 0 is checked.
Manual
Monitored
Figure 157: Guard lock logic manual/monitored reset
WARNING
If manual reset is selected, the next input after the inputs used by the function block must be used.
Example: If Input1 and Input2 are used for the function block, Input3 must be used for the reset input.
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