Pilz PSS SB HYD, Basic license - Manual (Page 124)

6-62 Modular Block System: Hydraulic Presses
Standard Function Blocks
Wiring the input parameters
Wiring for category 2 (ESPE/AOPD type 2)
It is sufficient to use one N/O contact from the ESPE/AOPD. In this case,
parameters for input parameters
NO_1 and NO_2 should be set for the
same input.
WARNING
If only one N/O contact is used, certain faults will not be detected. For this
reason you should carry out a function test of the ESPE/AOPD at regular
intervals. This requirement can be met by requesting an automatic
function test at appropriate intervals via the input parameter
Test.
Wiring for category 4 (ESPE/AOPD Type 4)
To achieve category 4 you will need to use two N/O contacts from the
ESPE/AOPD. Type 4 ESPE/AOPD devices with semiconductor outputs
can be connected to DI 2 inputs (e.g. input module PSS(1) DI 2) in order to
meet the requirements of category 4.
Test pulses
If the relay outputs of the ESPE/AOPD do not have their own test pulse
signals, these will need to be set via the PSS.
CAUTION
If you are using SB068 in single break or double break mode, do not use
Type 4 ESPE/AOPDs that attempt to automatically switch back to normal
mode after a short circuit between the ESPE/AOPD outputs. This would
cause the ESPE/AOPD outputs to switch from 0/1, which the block would
detect as a test pulse control signal - if test pulse monitoring time has not
yet elapsed - and this could trigger an unexpected start-up. The guard
function during the hazardous downward movement is retained, however.
Output parameters
• ENBL : Enable flag bit
ENBL = 0: Protected field broken
ENBL = 1: Protected field clear
The enable is issued if the protected field is clear,
(
NO_1 = 1, NO_2 = 1), any faults have been
rectified and the ESPE/AOPD has been
interrupted for cycling (see also under “Cycle
modes”).
SB068