7. Errors and error remedying
48
7.1.5 Hardware CU
Possible causes
Remedy
Self-monitoring (self-test) has detected an error
on the CU electronics board.
Replace the CU electronics board.
7.1.6 Hardware IO
Possible causes
Remedy
Self-monitoring (self-test) has detected an error
on the IO electronics board.
Replace the IO electronics board.
7.1.7 Communication IO
This message appears if communication between CU electronics board and IO electronics board is in-
terrupted (see spare parts drawing 9.1) and data exchange is no longer possible.
Possible causes
Remedy
Interface module defective.
Replace the CU and/or IO electronics board.
7.1.8 Watchdog
Possible causes
Remedy
Software error of the CU electronics board.
If this occurs several times, contact Sesotec ser-
vice.
7.1.9 Memory error
Possible causes
Remedy
System and product data memory defective.
Check whether the memory module is properly in-
serted in the socket (see page 12).
If necessary, replace the memory module. Then
select menu item "Factory settings".
Replace the CU electronics board.
7.1.10 Short circuit MV
This message is displayed if there is a short circuit in the magnetic valve switching outputs.
Possible causes
Remedy
Short circuit or connection broken to magnetic
valve 1.
Check valve cable for breaks and renew if neces-
sary.
Check valve cable plug and socket connections,
remove and reinsert if necessary.
7.1.11 Connection MV
This message is displayed if there is a break in the magnetic valve switching outputs.
Possible causes
Remedy
Short circuit or connection broken to magnetic
valve 2.
Check valve cable and connectors with Ohm me-
ter for short circuit, replace if necessary.
Check magnetic valve resistance which should be
320...340
(or 100...140
for pusher applica-
tion).