Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 277)

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Error Processing Section 9-2
9-2-11 I/O Setting Error Check
Yes
No
I/O Setting Error occurred
Are 5 or more Motion Control
Modules connected?
Reconfigure the system so that
4 or fewer Motion Control
Modules are connected to the
Coordinator Module.
Replace the Module.