4. WIRING
IMR01Y36-E2
18
4.5 Termination Resistor
Procedure for setting a termination resistor to Controller communication (RS-485) and its setting
position are described in the following.
If communication errors occur frequently due to the operation environment or the
communication distance, connect termination resistors.
Termination resistor setting position
It the COM-JH is connected to the extreme end of the communication line, install one termination
resistor each to the COM-JH and the controller located most distantly from the COM-JH.
Setting procedure of termination resistor (COM-JH)
As the COM-JH is internally provided with a selector switch for choosing the ON/OFF of a
termination resistor, it is not required to externally install the termination resistor.
(Factory set value: Termination resistor connected)
1.
Turn off the power supply of the module.
Do not separate the mainframe from the terminal base with the power turned on. If
so, instrument failure may result.
2.
Pull out the mainframe itself toward you (2) while pushing the locks at its top and bottom (1),
and then separate it from the terminal base.
Upper-side
lock
Lower-side
lock
Top view
Bottom view
Removing the module mainframe
(2) Pull out
(1) Push
(1) Push
Terminal base
Mainframe
Controller communication
(RS-485: Modbus)
COM-JH
Termination
resistor ON
(Factory
set value)
Z-TIO or Z-DIO module
Connect a termination
resistor to the terminals
from exterior.
Internal communication line
(RS-485)
Termination resistor
Refer to
4.4 Wiring
to the Controllers
(P. 17)
Controller (SRZ)