Rockwell Automation 1771-QRD PULS FLOWMTR - Manual (Page 17)

Installation
Chapter 3
3–6
Figure 3.3
Wiring for Active TTL Drivers
Note: The jumper between terminals 17 and 19 changes the sensitivity of
channels 3 and 4 so that they are compatible with TTL pulses.
The jumper between terminals 17 and 20 changes the sensitivity of
channels 1 and 2 so that they are compatible with TTL pulses.
Signal types may not be mixed within a channel pair.
For use with magnetic pickups or turbine flowmeters, do not connect a
jumper to these terminals.
WARNING: Remove power from the 1771 I/O chassis
backplane and from the wiring arm before removing or
installing the module.
Failure to remove power from the backplane or the wiring arm could
cause module damage, degradation of performance or injury.
Failure to remove power from the backplane could cause injury or
equipment damage due to possible unexpected operation.