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3. Operation
3.9 Fieldbus I/O Response Performance
As mentioned previously, respond times for fieldbus I/O can vary and depend on several
factors. The values in this section are shown for reference not for guaranteed performance.
DeviceNet
Test Environment
RC520 Controller: Pentium III 850 MHz 128 MB memory
Fieldbus I/O: PCI-DVNIO board Master (MAC ID: 0)
Baud rate: 500 kbps, 125 kbps
Connected Slave: Woodhead 16-input module (TDN-8C0-108)
Node address: 2
Connection Image
Power Tap
T-branch
Terminating
Resistor
To Standard Input
Waveform
Generator
Power Supply
+24V
NPN Output
PNP Output
Waveform
Modification Jig
Input Module
DeviceNet
I/F Board
T-branch
Terminating
Resistor
Evaluation
Signals with various pulse widths (every 5 msec) were input to the standard
I/O input and the input module of the fieldbus I/O at 1 Hz. For 10 minutes
(600 seconds), pulse widths of the received signals were measured at 125
kbps and 500 kbps.
Result
500 kbps: The input devices responded to 25-msec pulse.
125 kbps: The input devices responded to 30-msec pulse.
74 Fieldbus I/O Rev.6