Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET - Manual (Page 14)

1–4 Overview of the CFM Module
Publication 1771Ć6.5.99 - December 1995
The CFM module accepts input for up to four channels
(mode dependent). Each of the four input channels may accept these
input signals:
•
magnetic pickup — 50mV to 200V ac peak (optional 500mV to
200V ac peak for improved noise immunity)
•
4-40V dc pulses with open collector (TTL compatible)
•
proximity probe inputs
– compatible with Bently Nevada 3300 (5mm and 8mm)
proximity transducer systems
– provides two isolated 24V dc power supplies (rated at 12mA)
to power external devices
You configure the CFM module’s four input channels for your
specific application(s). Each input channel has two input selections:
Channel 0
Channel 1
Channel 2
Channel 3
flowmeter input (F0)
gate input (G0)
flowmeter input (F1)
gate input (G1)
flowmeter input (F2)
gate input (G2)
flowmeter input (F3)
gate input (G3)
flowmeter input (F0ĆF3) Ċ you connect
your input device to this input (ac, TTL)
gate input (G0ĆG3) Ċ accepts 4Ć40V dc
input pulse from open collector or external
contact closure. Used in Totalizer and
Nonresettable Totalizer modes to:
• store the current count of an input channel
upon impulse on gate
• interface to a prover when a prover is
enabled Ċ used to store the count as the
spheroid is sensed in the prover tube
four input channels ➀
➀ See pages 2-9 and 2-10 for wiring diagrams.
Input Capabilities