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Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 8
Use I/O Modules with CompactLogix 5370 L2 Controllers
Embedded I/O Modules
CompactLogix 5370 L2 controllers provide embedded I/O modules. The
catalog number determines the number and type of points. The following table
describes which embedded I/O modules CompactLogix 5370 L2 controllers
support.
You configure an RPI rate for the embedded I/O modules to establish time
intervals at which data is transmitted between the controller and each embedded
I/O point. The’ available RPI range of the embedded I/O points is
0.5
…
750.0 ms and can be changed by 0.5 ms increments. The default setting
is 20 ms.
Cat. No.
SInking/
Sourcing
24V DC
Digital
Input
Points
Sinking
24V DC
Digital
Output
Points
High-speed
Counters
High-speed
Counter
Output
Points
Universal
Analog
Input
Points
Analog
Output
Points
1769-L24ER-QB1B
16
16
-
-
-
-
1769-L24ER-QBFC1B
4
4
4
2
1769-L27ERM-QBFC1B
IMPORTANT
Remember the following when using the embedded I/O modules on
CompactLogix 5370 L2 controllers:
•
1769-L24ER-QB1B controller - The digital input points and digital output
points are on one embedded I/O module. Therefore, the 1769-L24ER-QB1B
controller is considered to have one embedded I/O module.
•
1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B controllers - The digital
input points and digital output points are on one embedded I/O module.
The high-speed counter input output points, universal analog input points,
and analog output points are on another single embedded I/O module.
Therefore, the 1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B controllers
are considered to have two embedded I/O modules.
IMPORTANT
•
If you attempt to use an RPI value that is not valid, the application
automatically rounds the value down to the closest 0.5 ms increment when
you apply the change.
For example, if you set the RPI = 1.75 ms, when you click Apply or OK, the
value is rounded down to 1.5 ms and applied.
•
The RPI value for an embedded I/O module is intended to establish a time
interval at which data is transmitted. However, the configuration of your
CompactLogix 5370 L2 control system can affect the actual time interval of
data transmission.
For more information, see
Estimate Requested Packet Interval on page 218
.
