Overview Of Design Flow - Omron CJ Series Operation Manual

1 Introduction
1-4

Overview of Design Flow

Perform the following steps to design the system.
1. Determine the number of I/O points.
Determine the number of I/O points in the entire system.
2. Match up the I/O points with specific Slave Units.
Determine the specific Slave Unit for each input and output.
3. Determine the number of nodes.
Determine how many nodes are to be connected.
4. Determine the layout.
• Determine the wiring form (trunk line-branch lines or unrestricted
branching).
• Determine the wiring distances.
• Determine the method for providing communications and I/O
power supplies to the Slave Units (with minimal wiring).
• Determine the type of cable to be used.
5. Temporarily determine the communications mode number and the baud
rate.
Note There are restrictions when you branch lines or use Flat Cable II. For
details, refer to 1-2-2 Branch Line and Multidrop Support for Cable Types
and Baud Rates.
6. Determine the communications cycle.
The communications cycle is determined from the communications
mode number and the baud rate.
(With communications mode 8, it also depends on the type and
number of Slave Units.)
Determine whether the required I/O response time can be
achieved at that baud rate.
7. Consider using more than one Master Unit.
If the desired distance and communications cycle cannot both be
achieved even after rechecking the communications mode number,
the baud rate, and the use of Repeater Units, then use more than
one Master Unit.
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CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
... Refer to 1-2 CompoNet Net-
work Specifications and 1-3
Devices in a CompoNet Net-
work.
... Refer to SECTION 3 Wiring
Configurations.
... Refer to 5-5 Remote I/O Com-
munications Performance.