Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET - Manual (Page 75)

Appendix
D
Publication 1771Ć6.5.99 - December 1995
Replace Your QRD Module
Use this appendix to install the CFM module as a replacement for the
QRD module.
To replace your QRD module you See page
Check Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Remove Your QRD Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Set the Configuration Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3
Set the Module Operation Jumper . . . . . . . . . . . . . . . . . . . . . . D-3
Check the Input Channel Jumpers . . . . . . . . . . . . . . . . . . . . . . D-4
Install the CFM (QRD) Module . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5
Make Connections to the New Wiring Arm . . . . . . . . . . . . . . . . . . . D-6
Resume Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8
Edit Your Ladder Logic Program . . . . . . . . . . . . . . . . . . . . . . . D-8
Read Data From the CFM Module . . . . . . . . . . . . . . . . . . . . . . D-9
Reset Total and Overflow Flags . . . . . . . . . . . . . . . . . . . . . . . . D-10
Interpret Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-11
Additional Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-11
Important: We assume that you are using a QRD module in your
existing system and that you are familiar with the I/O
module installation/removal procedures.
The CFM (QRD) module interfaces PLC processors with magnetic
pickups, single channel shaft encoders, turbine flowmeters, or any
source of TTL pulses.
When configured for QRD operation, the CFM (QRD) module
calculates the frequency once per second, independent of the
pulse edges.
The CFM (QRD) module is generally compatible with, but does not
require the use of, turbine flowmeter signal preconditioning modules.
It provides rate and count data in 2’s complement binary format to
the PLC processor’s data table through block data transfers.
Rates as high as 10.0kHz and counts as large as 32,767 are
supported. At overflow, the count continues from zero and an
overflow flag is set. The overflow flag can be reset by the ladder
logic. In addition, the PLC processor can reset any or all
counts directly.
Important: Input frequencies > 30.0kHz may return unpredictable
results in the BTR file.
What This Appendix
Contains
What the CFM Module
Does