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PAGE 10
4. A1 INSTALLATION
STATUS
1
2
3
+
+
+
This module provides a total of 16 analog inputs; 8 using 4-20 mA current
loop signals and 8 using single ended voltage inputs. The voltage inputs
can be configured for +5, +10 or +30 VDC full scale. Each input can be
independently configured for alarm reporting. The front panel shown in
Figure 9 has all of the external connections as well as status indicators
displaying the module state.
Connections
Front panel terminal block connections are shown in Figure 10.
Current Loop Inputs
The first 8 inputs on the module are the current inputs. Each input has
two terminals for placing it into the current loop. Current flow must be
such that the current source enters the + terminal and exits from the -
terminal. The input can be either at the top of the loop with the +
terminal connected to the loop excitation voltage, or it can be at the
bottom of the loop with the - terminal connected to the return of the
loop excitation supply. Internal impedance is 100 ohms so the drop
across the input is 2 VDC at full scale when 20 mA is flowing. The
maximum common mode voltage that can be placed on the inputs is
+35 VDC. If the loop is not connected or the current flow drops below
4 mA, an open loop alarm can be generated. This alarm can be
selected as either major or minor and is reported for the module and
not for a specific input. A current input circuit is shown in Figure 11.
ALARM
1
2
3
4
5
6
7
8
9
10
11
12
CURRENT INPUT
4
5
6
7
+
+
+
+
+
Figure 9 A1 Module Front Panel
Figure 10 Front Panel - Connections
13
14
15
16
VOLTAGE INPUT
8
9
10
11
12
13
14
15
16
A1 INSTALLATION
B1285-A1
- Quick Links:
- P1 Installation
- Handset Programming
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