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Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
Chapter 3
Input Module Features
Pulse Latching
You can use Pulse Latching to detect or latch short duration pulses. The
module can detect incoming pulses with a duration as short as 10 μs if the
frequency is under 4 kHz (period of 250 μs).
Pulse Latching is supported via the Timestamping feature and Timestamp
Latching.
To use Pulse Latching, you must complete the following:
• On the Module Definition dialog box in the Logix Designer application
project, set the Input Data parameter to Timestamp Data.
• Enable COS for the input point where a latch of short duration pulses is
needed. You can enable COS in the following ways.
COS is disabled by default on all points.
When the module detects a short duration pulse at an input point, the changes
that are described in this table occur.
DC INPUT
5069-IB16
DC OUTPUT
5069-OB16
ANALOG INPUT
5069-IY4
SA P
ow
er
MOD P
ow
er
ANALOG OUTPUT
5069-OF8
DC INPUT
5069-IB16
Standard Modules
™
NET B1
LINK B1
NET A1
LINK A1
NET A2
LINK A2
SPEED X1
LINK X1
OK
RUN
FORCE
FAN 1
SD
FAN 2
Compact
Logix
5480
B1
A1
1
2
A2
5069-L46ERMW
CONTROLLER
UPS
MP
SA
R
B
F
R
B
F
DC INPUT
5069-IB16
DC OUTPUT
5069-OB16
ANALOG INPUT
5069-IY4
ANALOG OUTPUT
5069-OF8
DC INPUT
5069-IB16
IMPORTANT
The following Compact 5000 I/O standard input modules support
Pulse Latching:
• 5069-IB16F
• 5069-IB6F-3W
Location in Logix Designer Application
Action
Module Properties dialog box > Points category >
Ptxx subcategory
Check the input transition type where you need to
latch short duration pulses.
For example, if you need short duration pulses
latched for Off to On transitions, check Off -> On
Input Transition.
Module tags
One or both of the following:
• Change the C.Ptxx.CaptureOffOnEn tag to 1.
• Change the C.Ptxx.CaptureOnOffEn tag to 1.
Input Transition Type
Where Pulse Is Captured
Change in Logix Designer Project
Off to On
• The I.Ptxx.TimestampOffOnNumber tag increments.
• The timestamp is recorded in I.Ptxx.TimestampOffOn tag.
On to Off
• The I.Ptxx.TimestampOnOffNumber tag increments.
• The timestamp is recorded in I.Ptxx.TimestampOnOff tag.