Quartech 2800 Manual page 11

2800 & 2900 Series PLC Drivers
The Idec Micro 3 series PLCs can be connected in a single master multiple slave network using the Data Link
interface. In this configuration multiple Micro 3 PLCs can be connected to a single OIT. One PLC must be assigned
as the host, meaning the Command Word and Screen Triggers are located in it. The OIT will be capable of reading
and writing data to the other PLCs on the network.
The OIT is connected to the network through the Quartech 9108 Network Link Adapter.
Model 9108
Network Link Adapter
Data Link Terminals
Micro3C or FL2A-LC1
Transmission Lines
The Data Link network is designed to be wired in a point-to-point fashion. All devices are wired in-line, one after
another, forming a single trunk line. Drop lines off the main trunk line are not recommended and may degrade or
prevent network operation. As the trunk line length increases two factors become increasingly important. These factors
are line resistance and line capacitance. In most applications the use of line terminating resistors will improve or allow
satisfactory performance. Two terminating resistors are required for a network regardless of the number of devices
in the network. One terminating resister is connected at each end of the network. The OIT includes a terminating
resistor that is switched into to the circuit by closing a DIP switch accessible through the cover. Refer to the Hardware
Manual for the particular OIT to identify which DIP switch is assigned. If the OIT is at either end of the network the
switch should be closed. Devices which are not at either physical end of the network must not have termination
resistors switched into the circuit.
Micro 3C Note: Set the protocol selector switch to position 2 (Loader Port). The front port and Data Link port can
then be used simultaneously.
F
)))))))))))))))))))))))
A
F
)))))))))))))))))))))))
B
F
)))))))))))))))))))))))
SG
Quartech 9108
F
A
F
B
F
SC
F
+)))))
SD
F
.)))))
GD
Page 11
DM2829_PLC Revision 2