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Auxiliary Voltage
The external auxiliary voltage U
the terminal is connected to the terminals X3: 17-18.
NOTE: Polarity of the auxiliary voltage Uaux (24 V dc, option B):
– = X3: 17 and + = X3: 18.
Serial Communication Connection
The device can be equipped with two optional communication
modules: Communication option 1 and Communication option 2.
The physical location of the modules is at the back of the relay. The
modules can be installed in the field (when power is first turned off).
Communication
option 1.
X3
1
2
3
4
5
Communication
6
option 2.
7
8
9
10
11
12
13
14
15
16
17
18
Figure 9.2 – Example of Allen-Bradley 857 Back Panel Serial Communication Connection
The internal connection in both communication modules is identical
(see Figure 9.3). The transmit and receive lines of all the three
"logical communication ports" REMOTE, LOCAL and
EXTENSION port are available for both modules (RS-232 signal
levels). Depending on the module type one or more of these ports
are physically available at the external connector.
The communication modules convert the RS-232 signal levels to
some other levels e.g. TTL, RS-485 or fiber-optics. The modules
may also contain intelligence to make protocol conversion on
software level.
(standard 40...265 V ac or dc) for
aux
X6
X8
X7
1
1
1
2
2
2
3
3
3
4
4
4
5
6
5
5
7
6
6
8
7
7
9
8
1
10
9
2
11
10
3
12
11
4
13
12
5
14
13
6
15
14
7
16
15
8
17
16
9
18
17
10
19
18
11
20
X2
9-5
Connections
X1
2
1
4
3
6
5
8
7
10
9
12
11
14
13
16
15
18
17
20
19
VAMP257serial communication
857-UM001A-EN-P – July 2009
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