Rockwell Automation 1756-IF4FXOF2F ControlLogix High-speed Analog I/O Module - Manual (Page 18)

18 Rockwell Automation Publication 1756-UM005B-EN-P - January 2013
Chapter 2 High-speed Analog I/O Operation in the ControlLogix System
Inputs and Outputs on the
Same Module The ControlLogix high-speed analog I/O module has 4 inputs and 2 outputs.
The following configurable parameters affect module behavior:
• Real Time Sample (RTS) —Defines the input update rate.
• Requested Packet Interval (RPI) —Defines the output update rate and
additional transfers of input data.
Real Time Sample (RTS)
The RTS is a configurable parameter (0.3…25 ms) that defines the input update
rate. This parameter causes the module to do the following.
1. Scan all input channels and store the data in on-board memory.
2. Multicast the updated channel data, as well as other status data, to the
backplane of the local chassis.
IMPORTANT The RTS value is set during the initial configuration. This value can be adjusted
anytime. To use sub-millisecond values, type values with a decimal point. For
example, to use 800 ms, type 0.8.
For more information on how to set the RTS, see Chapter 5 .
1
2
On-Board Memory
Status Data
Channel Data
Channel Data
Channel Data
Channel Data
Input 0
Input 1
Input 2
Input 3
Timestamp
Output Data Echo
Output Data Echo
Output 0
Output 1