Resetting The Fault Counter During Operation; Blockage In The Opposite Direction; Cyclic Communication With The Controller - Siemens SIMOCODE pro V Manual

2 Operating principle
2.2.9

Resetting the fault counter during operation

Counter 1 defines the maximum number of reversing attempts to be made when
conveying is blocked. If a blockage is cleared with fewer than the maximum
number of parameterized reversing operation, the counter retains its current count.
In this case, only the remaining number of reversals is available for another
blockage clearing before fault shutdown would be performed. Therefore, the logic
resets Counter 1 ahead of time in the following cases so that the full programmed
number of automatic reversal attempts is always available in future:
•
Manual motion in the opposite direction.
The socket "ON<" of the function block Control station is connected with input
3 of truth table TT6 for this purpose.
•
If no blockage is detected within a specific time interval (in the application
example: 1h). To do this, Timer 2 (which is parameterized as a closing delay) is
programmed via signal conditioning 2 (which is parameterized as a negation)
in such a way that it clears Counter 1 every hour with a pulse via input 2 of
truth table TT6. However, for every reverse run triggered by the logic, Timer 2
is reset so that it does not completely expire and the fault counter is also not
cleared.
2.2.10

Blockage in the opposite direction

If the drive also blocks in the opposite direction, which is detected by limit monitor 1
(which reacts to a current maximum in reverse motion), the logic initiates an
immediate reversal back to the conveying direction. For this purpose, the pertinent
limit monitor resets Timer 1 via truth tables TT5 and TT8 when a reverse motion is
detected (socket "QE2" of "Protection/Control"). Depending on the current count of
Counter 1, further reversal attempts may ensue, or a fault shutdown of the drive.
2.2.11

Cyclic communication with the controller

Cyclic receive
In addition to the cyclic receive data that are predefined for the reversing starter,
the following interconnections have been created:
•
Reset faults
The socket for bit 6 of the function block "Cyclic receive Byte 0" is
interconnected with input 3 of truth table TT3. If the SIMOCODE device is reset
via the communication after an error, the fault counter (Counter 1) is cleared
via this interconnection (see chapter 2.2.8).
•
Deactivate blockage prevention logic
The socket for bit 0 of the function block "Cyclic receive Byte 1" is
interconnected with input 4 of truth table TT9. If the PLC transmits "false" or if
no PLC is connected, then the blockage prevention logic is active. If "true", the
limit monitors 2, 3 and 4 are not evaluated (see chapter 2.2.2).
Blocking Protection for Pumps with SIMOCODE pro V
Article ID: 109478058, V2.0, 09/2020
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