Description Of Basic System Configuration - Omron CS1W-LC001 Operation Manual

Configuration of Instrumentation System
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Description of Basic System Configuration

Mounting of Units for External Analog I/O and Contact I/O
In most cases, the maximum external analog I/O refresh cycle is as
follows depending on the operation timing:
"approximately 5 times the CPU Unit's cycle time" + "approximately twice
the operation cycles of the Loop Control Unit's function blocks"
So, when determining the system configuration, calculate how long the
external analog I/O refresh cycle will be within the instrumentation system
based upon factors such as the CPU Unit's cycle time and the operation
cycles of the Loop Control Unit's function blocks. Also, assess whether or
not there will be any problems when running applications at the analog
I/O refresh cycle that you have calculated.
(For details on the relationship between the Loop Control Unit's operation
cycles and the CPU Unit's cycle time, see 3-2 Description of Operations.
For details on how to calculate the CPU Unit's cycle time, refer to the
CS1-series Operation Manual (W339-E1), 15-4 Computing the Cycle
Time.)
The Loop Control Unit does not have direct external analog I/O and contact
I/O functions. External I/O is achieved via Analog I/O Units and Basic I/O
Units mounted on a basic PC System (CPU Rack, Expansion Rack for the
CS1, Expansion I/O Rack for the C200H) or on a SYSMAC BUS Remote I/O
Slave Rack.
So, in the basic system configuration, Analog I/O Units (Analog Input Unit,
Analog Output Unit, and Analog I/O Unit) must be mounted for the same PC.
A Basic I/O Unit must also be mounted for the same PC as necessary.
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