Sartorius Sartocheck 4 plus - 14 PLC Control; Digital Inputs; START Input; PROG Input

86 PLC Control
14. PLC Control 14. PLC Control
14.1 Digital Inputs There are three digital inputs available (START, PROG and STOP). An impulse at one of
these inputs has to be at least 450 msec long for it to be correctly identified.
450 ms
14.1.1 START Input An impulse at the START input will start the test program stored in PLC1 or PLC2,
depending on the PROG input below (see section 7.13.1 for loading test programs
into memory locations PLC1 and PLC2).
If a test unit is currently active, then an impulse at the START input will have
no effect.
14.1.2 PROG Input In order to start PLC2, the PROG input needs to be set to high before the START
impulse is initialized. After the test has been completed, the PROG input has to be set
to low again.
14.1.3 STOP Input An impulse at the STOP input has the same effect as pressing the STOP key
on the Sartocheck
®
4 plus Filter tester unit and therefore will stop already started
programs on Sartocheck
®
4 plus Filter tester.
14.2 Digital Output There are seven digital outlets with the following description and function:
14.2.1 POWER on This outlet is always high when the PLC-function is activated in the unit.
14.2.2 TEST RUNNING The outlet is set to high when a START impulse is initiated from the PLC and the
additional conditions described above are fulfilled.
14.2.3 ERROR The ERROR outlet is set to high with every error which can occur during the test run.
Additionally, it is high when the temperature control is addressed or the operating
pressure in the functional control is too low.
14.2.4 TEST OK The outlet is high after the test is finished and has passed.
14.2.5 TEST not OK The outlet is high after the test is finished and has failed.
14.2.6 External Valve 1 The outlet is high if a START impulse is sent by the PLC, and is set back at the end
of the measurement phase.
14.2.7 External Valve 2 The outlet is high if a START impulse is sent by the PLC, and is set back at the end
of the measurement phase.
All outlets are chargeable with 0.3A. All outlets except the “POWER ON” display
are reset at high with a STOP impulse. After this STOP impulse, the unit is again ready
for the next test.