Rockwell Automation 1756-LSC8XIB8I ControlLogix Low-speed Counter Module User Manual
Page 9
Rockwell Automation Publication 1756-UM536A-EN-P - April 2012
9
Module Features
Chapter 1
Producer/consumer
model
Logix5000 controllers let you produce (broadcast) and consume (receive) system-shared
tags. The module can produce data without having to be polled first by a controller. The
module produces the data, and any owner-controller device or 1756-OB16IEF peer output
module can consume it.
The module produces count, frequency, and pulse width values at the RPI. In addition to the
RPI, the module also produces data whenever a Change of State (COS) occurs. A COS causes
an immediate production of data and is triggered by a change in value for these input tags:
• Pt[x].Data—Hardware input transitions On or Off.
• Counter[x].InWindow0—Count or frequency value enters or exits window 0 parameters.
• Counter[x].InWindow1—Count or frequency value enters or exits window 1 parameters.
Electronic Keying
Electronic keying prevents communication to a module that does not match the type and
revision expected. For more information, see
.
RIUP
RIUP is an abbreviation for removal and insertion under power. The module can be inserted
and removed from the chassis while power is applied. This flexibility allows you to maintain
the module, either removing or inserting, without disrupting the rest of the controlled
process.
WARNING: When you insert or remove a module while backplane power is
applied, an electrical arc may occur. An electrical arc can cause personal injury
or property damage as a result of the following:
• Sending an erroneous signal to your system’s field devices causing unintended
machine motion or loss of process control.
• Causing an explosion in a hazardous environment.
Repeated electrical arcing causes excessive wear to contacts on both the module
and its mating connectors. Worn contacts may create electrical resistance that can
affect module operation.
Table 2 - Digital I/O Module Features (continued)
Feature
Description