Omron CQM1H-CLK21 Communications Cycle Time, Specifying Network Parameters, Active Data Links

Communications Cycle Time Section 8-2

8-1-4 Specifying Network Parameters

The network parameters can be specified from the Controller Link Support Software. This section describes only the allowable setting range for each net- work parameter. Refer to the Controller Link Support Software Operation Manual (W308) for setting procedures.

The following table shows the setting range and default for network parame- ters.

Network parameter	Setting	Default
	range	value
Maximum node address	2 to 32	32
	(See note 1.)	(See note
		1.)
Number of polled nodes per communications cycle	1 to 31	4
Maximum no. of event-frames per communications	6 to 238	35
cycle

The network parameters become valid immediately after being set.

Note 1. The setting range will be 2 to 62 and the default value will be 62 when the Wired Network 62 Node Enable Bit in the DM Parameter Area software switches of the CS1W-CLK21-V1 or CJ1W-CLK21-V1 Unit is ON and the Unit is restarted.

2.Always stop the data link before changing network parameters.

3.Specify a value for the maximum node address that is equal to or greater than the maximum node address in the Controller Link Network.

4.For the CVM1 and CV-series PLCs, always set the System Protect Key Switch on the CPU Unit to NORMAL. Otherwise, the network parameter settings will not be stored normally.

5.The maximum node address cannot be changed to 32 when the Wired Network 62 Node Enable Bit is ON in the DM Parameter Area software switches of a CS1W-CLK21-V1 or CJ1W-CLK21-V1 Unit with unit version 1.2 or later.

8-2 Communications Cycle Time

This section describes how to calculate the communications cycle time.

8-2-1 Active Data Links

The following equations are used to calculate the communications cycle time when data links are operating.

Wired Systems

Baud rate						Equation
2 Mbps	10 ⋅	A + 600 ⋅	B + 290 ⋅		C + 320 ⋅		D + 4		⋅ E + 3,290 (∝s)
1 Mbps	18 ⋅	A + 1,150	⋅	B + 370	⋅	C + 360	⋅	D +	8 ⋅	E + 3,770 (∝s)
500 Kbps	34 ⋅	A + 2,260	⋅	B + 530	⋅	C + 440	⋅	D +	16 ⋅	E + 4,730 (∝s)

Note A: Total number of data link words within the network (total number of words in send areas of all nodes)

B:Number of polled nodes per comm cycle (value specified in the network parameters)

C:Number of nodes connected to the network

D:Number of nodes that send messages during the communications cycle

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