FP3 MEWNET-TR
Chapter4-1. Page.58
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3. Operation Mode Setting When an Error Occurs
1) Communication error
x In this case, the master station cannot communicate with the slave station, causing a communication error.
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Communication error example:
<Error condition: Disconnection of transmission cable>
FP3 transmitter
master unit
Disconnection
Communication enabled Communication error
01234
CPU
Power supply unit
<Error condition: No power supply to slave station No. 2>
No power supply
(communication error)
Communication enabled
No.1 No.2 No.3 No.4
FP3 transmitter
master unit
01234
CPU
Power supply unit
2) I/O control operation condition when a communication error occurs
x Operation mode selector No. 2 of the FP3 transmitter master unit and system register 21 let you select whether to
continue the I/O control of the properly operating slave stations or to terminate the I/O control of all slave stations
when a communication error occurs.
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To terminate all control of the CPU
x Set system register 21 to K0 (stop). When the register is set this way, operation mode selector No. 2 of
the FP3 transmitter master unit becomes ineffective regardless of the setting.
x The COM. LED of the FP3 transmitter master unit and FP I/O transmitter unit turns OFF when a communication
error occurs.
x To resume the control operation of the CPU and the units, turn OFF the power supply of the master station.
Then, after the cause of the communication error is removed, turn the power supply ON.
4-1. Operation Mode Setting
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