Omron CQM1H-CLK21 - Manual (Page 122)

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CVM1 and CV-series Controller Link Units Section 4-4
2. Do not set the same node address twice within the same Network. An error
will occur if the same address is set for two different nodes. The ERC indi-
cator on the front of the Unit will light and either communications will stop,
or the INS indicator will not light and you will be unable to participate in the
Network.
3. The send sequence for the data link areas is determined according to the
sequence of node addresses for automatically set data links.
4. Assign node addresses consecutively beginning from 01 whenever possi-
ble to minimize Network construction time.
4-4-4 Baud Rates
Set the following pins for the baud rate setting (DIP switch).
Note 1. Always turn OFF the PLC’s power before setting the baud rate.
2. Keep pins 3 and 4 set to OFF. If they are turned ON, internal data may be
erased.
Set the same baud rate for all the nodes on the Network using DIP switch pins
1 and 2 on the front of the Unit. The baud rate is set as shown below.
The maximum transmission distance will also change according to the setting.
Note The factory default setting is shown in bold.
Note Set the same baud rate for all the nodes on the Network. Normal communica-
tion cannot be performed unless the same baud rate is set for all the nodes.
4-4-5 Terminating Resistance
Turn ON the terminating resistance using the switch on the bottom of the Unit
for the Units of both ends of the Network. The terminating resistance is
required at both ends of a Network to absorb unnecessary signals and reduce
noise.
The Controller Link Unit has built-in terminating resistance, which can be con-
nected simply by turning ON the slide switch.
Pin 3, 4: Not used (must be OFF)
Pin 1, 2: Baud rate
The factory default setting is shown above.
ON
3
2
14
Switch Baud rate Maximum
transmission distance
Pin 1 Pin 2
OFF OFF 2 Mbps 500 m
ON OFF 1 Mbps 800 m
OFF ON 500 Kbps 1 km
ON ON Do not set.
Switch at the front Terminating resistance
OFF (factory default) Not connected.
ON connected
ON