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Appendix C
Module Schematics
Input
Z0 (12-24V)
Z1 (12-24V)
Z0 (5V)
Z1 (5V)
RET
Z0 RET
Z1 RET
CASE A – for 5V DC operation
gate input current = (gate input voltage - 2V
150
Examples
If gate input voltage = 5V DC
gate input current = (5V- 2V)
150
gate input current = 20 mA
1. There is approximately a 2V drop across (Q1 + the photodiode).
2. The operating range of the input is 5-10mA and Q1 functions as an overcurrent protection circuit. If an open collector
device with pull-up is used, the value of the pull-up must be added to the value shown in the denominator.
120
Gate Inputs
Gate inputs are used for running prover and store count values. There is one
gate that is associated with each flowmeter input circuit (G0 corresponds to
F0).
Series A Module
IMPORTANT This schematic represents the Series A module
R2
2
1 k
1
R1
150
4
C27
3
6
5
To turn on a gate circuit, you must source current through the input resistors
sufficient to turn on the opto-isolator in the circuit. If no connection is made
to the pair of gate terminals, no current flows through the photodiode of the
opto-isolator and that gate is OFF (the corresponding input status indicator is
OFF).
The input current magnitude can be determined by:
CASE B – for 10 V DC to 31.2 V DC operation
1
)
gate input current = (gate input voltage - 2V
2
Examples
If gate input voltage = 10V DC
gate input current = (10V- 2V)
gate input current = 7 mA
Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
D2
D1
Q1
D3
R6
R7
C28
2
1150
2
1150
physical and electrical isolation
U2
1
)
Examples
If gate input voltage = 31.2V DC
gate input current = (31.2V- 2V)
2
1150
gate input current = 25.4 mA
+5V
Z0
C26
Z1
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