2-2
Section
Simple System Configuration
20
2-1-5 Starting Remote I/O Communications During Operation
1, 2, 3...
1. Turn ON the communications power supply and then the power supply to
the Slaves (i.e., the PT).
2. Turn ON the power supply to the Master (i.e., the PC).
3. Switch the PC to RUN mode.
Reference It is alright to turn ON the following power supplies simultaneously. If the power
supplies cannot be turned ON simultaneously, turn them ON in the order listed
above.
Communications power supply and Slave (PT) power supply
Slave (PT) power supply and Master Unit (PC) power supply
All three power supplies
Observe the following precautions:
•
Use a DC power supply with low voltage fluctuation.
•
If the Slave’s (PT’s) power supply is turned ON before the communications
power supply, the Slave (PT) might not be added to the network.Turn the pow-
er supplies ON simultaneously or turn ON the communications power supply
first.
•
Always operate the Master Unit with the scan list enabled.
By operating with the scan list enabled, the Master can determine whether or
not the Slave (PT) is participating in the network so the user can check whether
the DeviceNet network is operating normally.
2-2
Simple System Configuration
OMRON manufactures a variety of devices that are compatible with the Device-
Net standard, including devices that handle bit I/O, temperature inputs, analog
I/O, and other functions. Moreover, devices manufactured by other companies
can be connected if they conform to DeviceNet standards.
It is also easy to change the configuration of a DeviceNet network since just one
cable is required for wiring.
Master
Communications
power supply
Slave
(C200H I/O Link Unit)
T-branch Tap
Slave
(Remote I/O
Terminal)
T-branch Tap with
Terminating Resistor
T-branch Tap
with Terminating
Resistor
Slave
(Temperature
Input Terminal)
PT connected to Devi-
ceNet Interface Unit
Slave
(Remote I/O
Terminal)
A PT connected to the network through a DeviceNet Interface Unit can perform
some of the functions of a control panel, such as switch operations and numeric
inputs as well as displaying the system’s operating status.
Precautions
