192 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 8 Use I/O Modules with CompactLogix 5370 L2 Controllers
Embedded High-speed Counters
The 1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B controllers
support four embedded high-speed counters. Each counter is a differential
input. Therefore, two input terminals are required for one counter. For
example, the A0+ and A0- terminals are required for counter A0.
The L2 embedded high-speed counters operate like the 1769-HSC module.
See 1769-UM006
for further information.
Each counter uses differential inputs that are compatible with standard
differential-line driver output devices and single-ended devices. Figure 34
shows the embedded high-speed counter input points.
Figure 34 - 1769-L27ERM-QBFC1B Controller Embedded High-speed Counter Wiring
Termination Points
IMPORTANT The embedded high-speed counters are available on only the
1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B controllers.
IMPORTANT Figure 34
shows the embedded high-speed counters on the
1769-L27ER-QB1B controller. The embedded high-speed counter points on
the 1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B controllers are
organized and wired the same.
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