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16
Instead of these written interlocking condi-
tions, the following logic diagram can be used:
CB OPEN
&
DISCONN.2 OPEN
DISCONN.2 CLOSED
&
INPUT 8 ACTIVE
ALWAYS
1
EARTH-SWITCH OPEN
&
DISCONN.3 NOT
UNDEFINED
Fig. 9. Simplified logic diagram for the inter-
locking logic in example 7.
Below a detailed logic diagram is shown.
203
&
202
2
&
8
61
1
205
&
104
Fig. 10. Detailed logic diagram for the inter-
locking logic in example 7.
The program commands are written on the basis
of the detailed logic diagram. As a default the
program area M200...M300 is filled with END
commands. The user overwrites these END
commands with the actual interlocking pro-
gram.
A configuration was set in example 2. If the
interlockings described above are to be used the
setting continues with the following commands.
ENABLE TO OPEN
DISCONNECTOR 1
ENABLE TO CLOSE
DISCONNECTOR 1
ENABLE TO OPEN CB
ENABLE TO CLOSE CB
20
ENABLE TO OPEN
DISCONNECTOR 1
21
ENABLE TO CLOSE
DISCONNECTOR 1
24
ENABLE TO OPEN CB
25
ENABLE TO CLOSE CB
The interlocking program for disconnector 2 is
here not given:
>99WM200:LOAD 203:XX
; Read open status of CB
>99WM201:AND 202:XX
; Read open status of disconnector 2
>99WM202:OUT 20:XX
; Enable opening of disconnector 1 if CB
and disconnector 2 are open
>99WM203:LOAD 2:XX
; Read the closed status of disconnector 2
>99WM204:AND 8:XX
; Read active status of input 8
>99WM205:OUT 21:XX
; Enable closing of disconnector 1 if dis-
connector 2 is closed and input 8 is active
>99WM206:LOAD 61:XX
; Read the value of special register 61
(always 1)
>99WM207:OUT 24:XX
; Always enable open command of CB
>99WM208:LOAD 205:XX
; Read open status of earth switch
>99WM209:ANDN 104:XX
; Read inverted undefined status (open or
closed status) of disconnector 3
>99WM210:OUT 25:XX
; Enable closing of CB if earth switch is
open and disconnector 3 is open or closed
>99WM211:END:XX
; End of interlocking program
>99WS198:1:XX
; Change interlocking program into run
mode
>99WS199:1:XX
; Starts interlocking program
>99WV151:1:XX
; Store the set parameters
The program is automatically compiled, when
the operation mode is re-entered. If syntax errors
are detected in the program, the interlocking
program remains in the setting mode. When the
syntax errors have been corrected the interlock-
ing program can be changed to operation mode.
The interlocking program can be by-passed in
two ways;
- For testing purposes the SG1/1 switch on the
front panel can be turned into position 1.
Then the interlocking program is interrupted
and opening/closing of the object is always
enabled.
- If the interlocking logic is to be taken out of
use permanently variable S199 is set to 0.
Then opening or closing of the object is always
enabled.
The interlocking program does not affect the
tripping signals of the protection relay modules.
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