Omron CS1W-ETN21 operation manual CJ-series Ethernet Units

Switch Settings Section 2-2

2-2-2 CJ-series Ethernet Units

Setting the Unit Number

The unit number is used to identify individual CPU Bus Units when more than one CPU Bus Unit is mounted to the same PLC. Use a small screwdriver to make the setting, taking care not to damage the rotary switch. The unit num- ber is factory-set to 0.

3456
2			8
01
		7
E			9
		A
F
DC
	B

UNIT

No.

Setting range:

0 to F

Note (1) Turn OFF the power supply before setting the unit number.

(2)If the unit number is being set for the first time or changed, then I/O tables must be created for the PLC.

(3)With CS-series and CJ-series PLCs, dedicated areas are automatically allocated in the CIO Area and DM Area according to the unit numbers that are set. For details, refer to SECTION 4 Ethernet Unit Memory Alloca- tions.

Setting the Node Address

With the FINS communications service, when there are multiple Ethernet Units connected to the Ethernet network, the Ethernet Units are identified by node addresses. Use the node address switches to set the node address between 01 and FE hexadecimal (1 to 254 decimal). Do not set a number that has already been set for another node on the same network.

	4		7		NODE
3		5
2			6
01					No.
				8
E				9
			A
F		B			⋅ 16	1
	DC
3456
2				8
01
			7
E				9
			A
F	DC				⋅ 16	0
		B

Setting range:

01 to FE (1 to 254 decimal)

The top switch sets the sixteens digit (most significant digit) and the bottom switch sets the ones digit (least significant digit). The node address is factory- set to 01.

Note Turn OFF the power supply before setting the node address.

Relation to IP Addresses When using the automatic generation method (either dynamic or passive) for address conversion, set the rightmost byte of the IP address set for the Ether- net Unit to the same value as the node address. If this is not possible, either the IP address table method or the combined method must be used for address conversion. (For details, refer to 5-2 IP Addresses in FINS Communi- cations.) If the FINS communications service is not used on the Ethernet net- work, then it is all right to overlap with other Ethernet Units. The setting, however, must be made within a range of 01 to FE. If a value outside of this range is set, the ERC indicator will light.

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