
Analog Input Module8
Publication
17715.45 - July 1997
Source Ground
-
Unused channels must have their + and
inputs jumpered together and tied to
module common to reduce noise.
1771WG
Field Wiring Arm
Attention: Analog input signals must be within +
14.25V referenced
to module common. If an input channel exceeds this range,
channeltochannel crosstalk can cause invalid input readings and
invalid underrange or overrange bits.
NOTE:
The 1771IFE module does not supply loop power for the input device.
The user must supply loop power for looppowered input devices.
+
–
Channel
1+
Channel 1
Channel 2+
Channel 2
Channel 3+
Channel 3
Channel 4+
Channel 4
Channel 5+
Channel 5
Channel 6+
Channel 6
Channel 7+
Channel 7
Channel 8+
Channel 8
Module Common
Not used
Not used
Not used
Module Common
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Configuring
the module for dif
ferential inputs does not provide isolation.
-T
ie power supply grounds together to
minimize ground loops.
Note:
Refer to transmitter manufacturers
specifications for power supply connections.
+
Power
Supply
2Wire
Transmitter
Power
Supply
2Wire
Transmitter
–
The sensor cable must be shielded. The shield must:
•
extend the length of the cable, but be connected only at the 1771 I/O chassis
•
extend up to the point of termination
Important:
The shield should extend to the termination point, exposing just enough cable to
adequately terminate the inner conductors. Use heat shrink or another suitable
insulation where the wire exits the cable jacket.
Connection
Diagram for 8 Differential Inputs and T
woW
ire T
ransmitters
Source Ground
-
Unused channels must have their + and
inputs jumpered together and tied to
module common to reduce noise.
1771WG
Field Wiring Arm
Attention: Analog input signals must be within +
14.25V referenced
to module common. If an input channel exceeds this range,
channeltochannel crosstalk can cause invalid input readings and
invalid underrange or overrange bits.
NOTE:
The 1771IFE module does not supply loop power for the input device.
The user must supply loop power for looppowered input devices.
+
–
Channel
1+
Channel 1
Channel 2+
Channel 2
Channel 3+
Channel 3
Channel 4+
Channel 4
Channel 5+
Channel 5
Channel 6+
Channel 6
Channel 7+
Channel 7
Channel 8+
Channel 8
Module Common
Not used
Not used
Not used
Module Common
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Configuring
the module for dif
ferential inputs does not provide isolation.
-T
ie power supply grounds together to
minimize ground loops.
Note:
Refer to transmitter manufacturers
specifications for power supply connections.
+
–
The sensor cable must be shielded. The shield must:
•
extend the length of the cable, but be connected only at the 1771 I/O chassis
•
extend up to the point of termination
Important:
The shield should extend to the termination point, exposing just enough cable to
adequately terminate the inner conductors. Use heat shrink or another suitable
insulation where the wire exits the cable jacket.
Power
Supply
4Wire
Transmitter
Power
Supply
4Wire
Transmitter
Connection
Diagram for 8 Differential Inputs and FourW
ire T
ransmitters
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