SYSTEM
4–118
Figure 4-46: An example of BCD decoder connections to an IO_C card for up to 19 taps
Table 4-34: All BCD combinations supported by the relay
MIN
BCD bit 6
BCD bit 5
TAP
Input
Input
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
+Tap
0
0
MIN
BCD bit 6
BCD bit 5
TAP
Input
Input
+Tap
0
1
+Tap
0
1
+Tap
0
1
+Tap
0
1
+Tap
0
1
+Tap
0
1
+Tap
0
1
BCD bit 4
BCD bit 3
BCD bit 2
Input
Input
Input
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
BCD bit 4
BCD bit 3
BCD bit 2
Input
Input
Input
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
BCD bit 1
TAP
Input
Position
0
0
1
1
0
2
1
3
0
4
1
5
0
6
1
7
0
8
1
9
0
invalid
1
invalid
0
invalid
1
invalid
0
invalid
1
invalid
BCD bit 1
TAP
Input
Position
0
10
1
11
0
12
1
13
0
14
1
15
0
16