Woodward DTSC-200A - Limit Switch Monitoring Truth Tables; Standard Switch Type - Truth Table

Manual 37941A DTSC-200A - ATS Controller - Operation
Page 24/37 © Woodward
Truth Tables
The truth tables indicate all possible reply signal combination conditions and the respective reactions of the ATS
controller depending on the configuration of the parameters 3424 "Transfer switch type" and 3434 "Use limit sw.
OPEN replies" after 3463 ‘Limit switch Failure delay’ is gone. All conditions, which are OK according to the ta-
ble columns Actual and(!) Expected do not result a "Limit switch fail" message and have a grey background that
stands for ‘Not displayed’ but they are relevant for enabling the ‘Reset’ button for manual acknowledge.
Table 3-1 is valid for the following settings:
• Parameter 3424 "Transfer switch type" is configured to "Standard"
• Parameter 3434 "Use limit sw. OPEN replies" is configured to "NO"
S1 preferred
98.11 LM:
S1 Priority
S1 source OK
LM 19.01
S2 source OK
LM 19.11
S1 closed signal
S2 closed signal
Actual
Expected
0
0
0
0
0
-----
S2
0
0
0
0
1
OK
OK
0
0
0
1
0
OK
OK
0
0
0
1
1
S1 S2
S2
0
0
1
0
0
-----
S2
0
0
1
0
1
OK
OK
0
0
1
1
0
OK
OK
0
0
1
1
1
S1 S2
S2
0
1
0
0
0
-----
S1
0
1
0
0
1
OK
OK
0
1
0
1
0
OK
OK
0
1
0
1
1
S1 S2
S1
0
1
1
0
0
-----
S2
0
1
1
0
1
OK
OK
0
1
1
1
0
OK
OK
0
1
1
1
1
S1 S2
S1
1
0
0
0
0
-----
S1
1
0
0
0
1
OK
OK
1
0
0
1
0
OK
OK
1
0
0
1
1
S1 S2
S1
1
0
1
0
0
-----
S2
1
0
1
0
1
OK
OK
1
0
1
1
0
OK
OK
1
0
1
1
1
S1 S2
S2
1
1
0
0
0
-----
S1
1
1
0
0
1
OK
OK
1
1
0
1
0
OK
OK
1
1
0
1
1
S1 S2
S1
1
1
1
0
0
S1 S2
S1
1
1
1
0
1
OK
OK
1
1
1
1
0
OK
OK
1
1
1
1
1
S1 S2
S1
Table 3-1: Limit switch monitoring - truth table for "Standard" limit switch w/o "Open" replies