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Timestamp Accuracy = +/- 12.5 μs.
Module Input Pin OFF->ON to Timestamp (Hardware + Firmware) Delay (µs)
Ambient Temp °C
Voltage
10V DC
24V DC
30V DC
Module Input Pin ON->OFF to Timestamp (Hardware + Firmware) Delay (µs)
Ambient Temp °C
Voltage
10V DC
24V DC
30V DC
Maximum input frequency (for each input) = 250 Hz 50% duty cycle. The
module can provide unique timestamps for input transitions on separate
inputs as long as they occur 25 μs apart. An input that changes state less than
25 μs after another input may receive the timestamp of the first input.
EXAMPLE
For example, if you are turning ON a 1732E-IB8M8SOER module input at
24V DC in 25 °C conditions, the signal propagation delay is 19 µs. If you
want to calculate the actual time the signal reaches the module input pin,
subtract 19 µs from the timestamp.
If you are turning OFF an input at 30V DC in 60 °C conditions, the signal
propagation delay is 94 µs. If you want to calculate the actual time the
signal reaches the module's input pin, subtract 94 µs from the timestamp.
The timestamps acquired are accurate to +/- 40 µs as noted earlier.
The timestamp data being produced on Ethernet is also delayed by the
input filter setting and the RPI setting.
Per Point Mode of Operation
The Per Point mode of operation provides a single On and Off timestamp for
each input point on the module. The 1732E-IB8M8SOER module employs CIP
Sync Per Point.
(a) The timestamp accuracy of +/- 40 μs does not include errors introduced by the module clock being tuned
using CIP Sync. This error can be less than one microsecond on a properly configured network.
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
Chapter 10
Use the Sequence of Events Input and Scheduled Output Modules
(a)
-20
25
60
23
24
25
18
19
19
18
19
19
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60
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84
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73
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