Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 117)

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Coordinator Module Section 4-1
4-1-3 I/O Refreshing and Peripheral Servicing
I/O Refreshing I/O refreshing updates general-purpose I/O status. All I/O is refreshed in the
same cycle (i.e., time slicing is not used). I/O refreshing is always performed
after program execution.
Cyclic Refreshing For cyclic refreshing, data is exchanged every cycle between predetermined
areas and the Motion Control Modules.
Peripheral Servicing Peripheral servicing involves servicing non-scheduled events for external
devices. This includes both processing for service requests from external
devices and service requests to external devices. Most peripheral servicing
involves FINS commands.
The time specified in the system is allocated to each type of servicing and
executed every cycle. If the servicing is finished before the end of the allo-
cated time, the remaining time is not used and the next servicing is started.
Note Servicing for Motion Control Modules, peripheral ports, RS-232C ports, and
RS-422A ports is allocated 6.25% of the immediately preceding cycle time by
default. If servicing is separated over more than one cycle, delaying comple-
tion of the servicing, set the actual amount of time for Set Time to All Events
(same time for all services) rather than a percentage on the Timer/Peripheral
Service Tab Page in the System Setup.
4-1-4 Startup Initialization
The following initialization is performed once each time the power is turned
ON.
• Detecting mounted Modules
• Clearing the non-retained areas of I/O memory
• Clearing forced-set/reset status
• Performing self-diagnosis (user memory check)
• Restoring the user program
• Restoring retained DM Area data
Servicing Contents
Motion Control Mod-
ule event servicing • Non-scheduled servicing for FINS commands from Motion
Control Modules.
• Non-scheduled servicing for FINS commands from the Coor-
dinator Module to the Motion Control Modules.
Peripheral port ser-
vicing • Non-scheduled servicing for FINS or Host Link commands
received via the peripheral or RS-232C ports from the CX-
Programmer, PTs, or host computers (e.g., requests for pro-
gram transfer, monitoring, forced-set/reset operations, or
online editing).
• Non-scheduled servicing from the Coordinator Module trans-
mitted from the peripheral or RS-232C port.
RS-232C port ser-
vicing
RS-422A port servic-
ing • Non-scheduled servicing to Servo Driver.