Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 34)

Aseembly and Installation
Chapter 2
2Ć21
Figure 2.10
Current Mode Input Using External +15V dc Supply
PID Module
TERMINAL IDENTIFICATION
18 INPUT 1 (+LEAD)
+
CAT. NO. 1771-PDC
TERMINAL FUNCTION
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
INPUT 1 (-LEAD)
INPUT 2 (+LEAD)
INPUT 2 (-LEAD)
TIEBACK INPUT 1
TIEBACK INPUT 2
ANALOG OUTPUT 1
MODULE COMMON
ANALOG OUTPUT 2
+ 15V DC
15V DC COMMON
- 15V DC
MANUAL MODE 1
MANUAL MODE 2
MANUAL REQUEST
OPT. +5V DC COMMON
OPTIONAL +5V DC
NOT USED
-
1771-PD
Two-Wire
(+)
General
PV
R
R Recorder or indicating instrument if used
10997
Transmitter
+4 to +20mA
(-)
Manual Control
Station
Input
Separate Supply
If additional compliance is not selected (as when one of the module
outputs is configured in voltage mode), a separate DC power supply must
be used to power the input current loop.
Power Supply Voltage
When selecting the power supply to operate the input current loop, the
required voltage must be equal to the voltage drop across all impedances
at the maximum current of 20mA. Current transmitters typically require a
voltage drop of 18V dc or more. The process variable input impedance of
the PID module (250 ohms), manual control station (100 ohms), recording