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ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 46

Protection relay
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Technical Reference Manual, General
X1
X4.1
X3.1
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
Data A
RS-485
10
Data B
10
11
12
13
14
15
16
17
1
Service pin
18
X4.2
Tx
X3.2
1
2
3
Rx
4
X3.3
5
6
7
8
9
10
11
12
13
14
CE
15
16
17
18
Made in Finland
RearViewMedium
RearViewHigh_a
)LJ 
5HDU YLHZ RI 5(;  +LJK
X4.1
X3.1
1
1
2
2
X2.1
3
3
1
4
4
5
5
2
6
6
X2.2
7
7
8
8
1
9
9
Data A
RS-485
2
10
10
Data B
11
X2.3
12
1
13
14
2
15
16
17
1
Service pin
18
X4.2
X2.4
Tx
X3.2
1
1
2
2
3
Rx
4
X2.5
X3.3
5
1
6
2
7
8
X2.6
9
10
1
11
2
12
13
CE
14
15
16
17
18
Made in Finland
RearViewMedium
RearViewSensor_a
)LJ 
5HDU YLHZ RI 5(;  6HQVRU
1. Service Pin is mounted if the HW version contains LON.
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

X1
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

1MRS 751108-MUM

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