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Appendix C
Module Schematics
Output Circuits
physical and electrical isolation
Vcc
R159
U20
Output 0
Output 1
122
The module provides two output circuits.
Discrete Outputs
The module's outputs are composed of isolated power MOSFETs. These devices
operate in current sourcing mode, and can deliver up to 1 A (@ 10-31.2V DC) and
20 mA (@ 5V DC).
Series A Module
IMPORTANT This schematic represents the Series A module
R109
D25
R108
The 1756-CFM/A module contains two output circuits. Customer supplied
power, ranging from +5V to +31.2V DC, is connected internally (through
terminals #18 and 20) to the power output transistors.
When an output is turned on, current flows into the source, out of the drain,
through the load connected to the ground of the customer supply (customer
return). Diode D26 protects the power output transistor Q11 from damage due
to inductive loads.
Output transistor Q11 is thermally protected power MOSFET and turns off at
approximately 4 A. After an output goes into thermal shutdown, you must fix
the cause of the shutdown and toggle the output OFF and ON to reenergize the
output.
Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Output FET
D24
Q11
D26
Customer
F1
18
Vcc
20
Customer
Vcc
16
Output 0
15
Output 1
Customer
common
19
Customer
17
common
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