Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 85
Fast Module Features Chapter 5
Response Time
The tables below indicate the screw-to-backplane response time of fast input and
fast output modules.
Features Specific to
Fast Input Modules
The table below lists features specific to ControlLogix fast digital input modules.
Table 16 - Input Response Time
Delay Response Time
Total On/Off delay (screw to backplane) 14 s nom/23 s max + user-configurable filter time
Hardware delay < 1 µs nom, 2 µs max
Firmware delay 13 µs nom, 21 µs max
User-configurable filter time 0…30,000 µs
Table 17 - Output Response Time
Delay Response Time
Total On/Off delay (screw to backplane) 14 s nom/23 s max
Hardware delay < 1 µs nom, 2 µs max
Firmware delay 13 µs nom, 21 µs max
Topic Page
Pulse Capture 86
Per Point Timestamping and Change of State 87
Software Configurable Filter Times 90
Dedicated Connection for Event Tasks 93
In RSLogix 5000 software, version 18.02.00 and 19.01.00, output tag
information is sent to the 1756-IB16IF module only at the RPI rate defined
during configuration. For optimal performance, use an Immediate Output (IOT)
instruction.
For example, the rung shown below contains an IOT instruction for a fast input
module in slot 3. Add a similar rung to your last routine within the Main Task to
mimic normal output tag processing.
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