Rockwell Automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE Input and Scheduled Output Modules UM - Manual (Page 89)

Rockwell Automation Publication 1732E-UM003B-EN-E - March 2014 79
Use the Sequence of Events Input and Scheduled Output Modules Chapter 10
Timestamp Accuracy = +/- 12.5 μs.
(1)
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.
Module Input Pin OFF->ON to Timestamp (Hardware + Firmware) Delay (
µs)
Ambient Temp ºC -20 25 60
Voltage
10V DC 23 24 25
24V DC 18 19 19
30V DC 18 19 19
Module Input Pin ON->OFF to Timestamp (Hardware + Firmware) Delay (µs)
Ambient Temp ºC -20 25 60
Voltage
10V DC 59 75 84
24V DC 70 84 93
30V DC 71 85 94
(1) 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.
EXAMPLE For example, if you are turning ON a 1732E-IB8M8SOER
module input at 24V DC in 25 ºC 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 ºC
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.