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What This Appendix
Contains
Input Circuits
TTL level
+5V
4V DC level
F1
7
Input
F0
8
RET
F0 Return
10
F1 Return
9
Module Schematics
Use this appendix to understand the internal logic of the 1756-CFM module.
Follow the wiring practices that are described in your system-level installation
manual when wiring your I/O devices. This includes:
•
Routing conductors
•
Grounding practices
•
use of shielded cables
The module input logic consists of:
•
Flowmeter input circuits
•
gate input circuits
Flowmeter Inputs
The flowmeter input circuit combines operational amplifier principles with
solid-state devices to provide constant logic pulses internal to the module. The
circuit is designed to interface with both active or passive sensor inputs by
accepting any pulse output device (such as turbine flowmeter, magnetic
pickup or digital pickup).
+5V
R116
U21
R117
R118
U22
R119
R120
D32
U23
R123
C76
RV1
D33
C74
Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
V
REF
physical and electrical isolation
R121
C70
R125
S ¥
D34
R126
Appendix
+5V
U4
C40
R29
C
F0
F1
42845
119
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