Interface Quantity Supplementary note
● Channel
configured
as an input
Max. 16 channels
DIQ (DIQ<n>)
● Input voltage max. 30 V
● Integrated sensor supply
Maximum current per channel: 500 mA
● Channel 0 and Channel 1 (with "Counter ..."
submodule):
"Counter" and "Frequency measurement" operating
modes
● Channel
configured
as an output
Max. 16 channels
DIQ (DIQ<n>)
● Signal voltage max. 30 V
● Maximum current per channel: 500 mA
Note: The parallel connection of the DQ channels is im‐
permissible.
Free channel possible as output for the comparison value
status (when using the "Counting" function).
Power supply PSx
24 V terminal PSx (X80/X81) Redundant supply possible
Connection for ref‐
erence potential
(ground)
6 connections for ref‐
erence potential
(ground) (X82)
For optional connection of a sensor to ground.
Additional information
● Section "Technical specifications (Page 147)"
4.4 "Counter" and "Frequency measurement" operating modes
Operating modes for selected digital inputs
You can activate the following functions for selected digital inputs:
● "Counter" operating mode
● "Frequency measurement" operating mode
Both operating modes are based on counting detected pulses. You can find additional
information on this in the section "Introduction to counting and frequency measurement
(Page 36)".
The function of the DI channel is processed independently of the operating mode.
You can find information on the digital inputs in the following sections:
● CFU PA: Overview of the interfaces (Page 24)
● CFU DIQ: Overview of the interfaces (Page 25)
Operation planning
4.4 "Counter" and "Frequency measurement" operating modes
SIMATIC CFU
26 Commissioning Manual, 08/2019, A5E39252870-AD
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