Rockwell-automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE In Manual de usuario descargar pdf (Pagina 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.

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Rockwell-automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE In Manual de usuario Pagina 89