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Design the circuit in such a way that the external power supply is turned on after the IBM PC/AT
compatible PC is powered on. Turning on the external power supply first may cause accidents
due to an erroneous output or a malfunction.
When a communication error occurs in the data link, the operation status of the communication
aulty station will change according to the type of the data link used. Configure an interlocking
circuit in a user program using the communication status information so that the safety of the
overall system is always maintained.
Erroneous outputs and malfunctions may lead to accidents.
1) The data link retains the data before the communication error.
2) All outputs are turned off at the MELSECNET (II, /B, /10) remote I/O stations.
3) Either the output is retained or all outputs are turned off at the MELSECNET/MINI-S3
remote I/O stations, depending on the E.C. mode setting.
For more information about how to check for communication errors and the operation status at
he time of a communication error, see the manual for the corresponding data link system.
When configuring a system, do not leave any slots vacant in the extension base unit. Should
here be any vacant slots, always use a blank cover (A1SG60) or a dummy module (A1SG62).
f any of the vacant slots are not covered, the module's internal parts may blast when a short
circuit test is performed, or overcurrent or overvoltage is accidentally applied to the external I/O
area.