
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: | |
Baud rate: | 500 kbps, 125 kbps |
Connected Slave: Woodhead
Node address: 2
Connection Image
Power Tap
Terminating
Resistor
DeviceNet I/F Board | Power Supply |
| |
| +24V |
Evaluation
Terminating
Resistor
Input | To Standard Input | |
Waveform | ||
Module | ||
Generator | ||
| ||
| NPN Output | |
| PNP Output | |
| Waveform | |
| Modification Jig |
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
500kbps: The input devices responded to
125kbps: The input devices responded to
74 | Fieldbus I/O Rev.6 |