Names and Functions of Parts | FP2−CCU |
2.1Names and Functions of Parts
2.1.2Operating Status LEDs
These display the operating status of the unit, such as communication conditions and error/alarm situations.
Display |
|
| Operation |
ALARM (red) |
| Lighted: Unit error (lights on watchdog timer error) | |
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| Not lighted: Goes out when there is no error |
COM. 1 | SD (green) |
| Flashes while data is being sent |
| Send Data monitor | ||
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| Goes out when no data is being sent |
| RD (green) |
| Flashes while data is being received |
| Receive Data monitor | ||
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| ||
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|
| Goes out when no data is being received |
| ERR (red) |
| Lights if communication error occurs |
| Communication error | ||
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|
| Goes out if normal frame is received |
COM. 2 | SD (green) |
| Flashes while data is being sent |
| Send Data monitor | ||
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|
| Goes out when no data is being sent |
| RD (green) |
| Flashes while data is being received |
| Receive Data monitor | ||
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|
| Goes out when no data is being received |
| ERR (red) |
| Lights if communication error occurs |
| Communication error | ||
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| Goes out if normal frame is received |
LED status ( | : Lighted | : Flashing | : Not lighted) |
Tip
The communication error (ERROR LED) lights if a parity, framing, overrun, or BCC error occurs.
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