Overview Of Design Flow - Omron CS1W-CRM21 Operation Manual

Overview of Design Flow

1-4 Overview of Design Flow
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 Branching is not possible at a baud rate of 4 Mbps, so Bit Slave Units with Flat
Cable cannot be used.
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 Mas-
ter Unit.
Perform the following steps to design the system.
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Section 1-4
...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 5-3 Remote I/O
Communications Perfor-
mance.
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