Initialization At Startup - Omron SYSMAC CS Series Operation Manual

CPU Unit Operation
Peripheral Servicing
Units
Event servicing for CS-
series Special I/O Units
Event servicing for CS-
series CPU Bus Units
Event servicing for
Inner Boards
Peripheral port servic-
ing
RS-232C port servicing
Communications port
servicing
File access servicing

10-1-3 Initialization at Startup

Peripheral servicing involves servicing non-scheduled events for external
devices. This includes both events from external devices and service requests
to external devices.
Most peripheral servicing for CS-series PLCs involved FINS commands. The
specific amount of time set in the system is allocated to each type of servicing
and executed every cycle. If all servicing cannot be completed within the allo-
cated time, the remaining servicing is performed the next cycle.
Non-scheduled servicing for FINS commands from CS-series Special I/O Units, CS-series CPU
Bus Units, and Inner Boards (e.g., requests to start external interrupt tasks)
Non-scheduled servicing for FINS commands from the CPU Unit to the above Units.
Non-scheduled servicing for FINS or Host Link commands received via the peripheral or RS-
232C ports from Programming Devices, PTs, or host computers (e.g., requests to transfer pro-
gramming, monitoring, forced-set/reset operations, or online editing
Non-scheduled servicing from the CPU Unit transmitted from the peripheral or RS-232C port
(non-solicited communications)
Servicing to execute network communications, serial communications, or file memory access
for the SEND, RECV, CMND or PMCR instructions using communications ports 0 to 7 (internal
logical ports)
Servicing to execute background execution using communications ports 0 to 7 (internal logical
ports) (CS1-H CPU Unit only)
File read/write operations for Memory Cards or EM file memory.
Note 1. CS-series Special I/O Units, CS-series CPU Bus Units, RS-232C commu-
nications ports, Inner Boards, and file servicing is allocated 4% of the cycle
time by default (the default can be changed). If servicing is separated over
many cycles, delaying completion of the servicing, set the same allocated
time (same time for all services) rather than a percentage under execute
time settings in the PLC Setup.
2. In either of the Parallel Processing Modes for the CS1-H CPU Unit, all pe-
ripheral servicing except for file access is performed in the peripheral ser-
vicing cycle.
The following initializing processes will be performed once each time the
power is turned ON.
• Detect mounted Units.
• Compare the registered I/O tables and the actual Units.
• Clear the non-holding areas of I/O memory according to the status of the
IOM Hold Bit. (See note 1.)
• Clear forced status according to the status of the Forced Status Hold Bit.
(See note 2.)
• Autoboot using the autotransfer files in the Memory Card if one is
inserted.
• Perform self-diagnosis (user memory check).
Servicing
Section 10-1
487