Yaskawa 120 Series I/O Modules - Manual (Page 254)

6.2 Panel Wiring
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4) Wiring the Analog Input Modules (4 to 20 mA, 4 channel)
a) Connecting Current Signal Source
(1) Connect + side of a current signal to “+” terminal of the Module.
(2) Connect - side of a current signal to “-” terminal of the Module.
(3) Connect the shield of a shielded twisted-pair wire to “Shield” terminal of the
Module and short “Shield” terminal, “S” terminal, and “-” terminal.
Incorrect connection will make the input signal unstable and cause malfunction.
b) Connecting Voltage Signal Source
(1) Connect + side of a voltage signal to “+” terminal of the Module.
(2) Connect - side of a voltage signal to “-” terminal of the Module.
(3) Connect the shield of a shielded twisted-pair wire to “Shield” terminal of the
Module and short “Shield” terminal to “-” terminal. Open “S” terminal of the
Module.
Incorrect connection will make input signal unstable and cause malfunction.
c) For an unused input circuit, short its “+” terminal to “-” terminal and also short one of
these terminal to its “Shield” terminal.
Incorrect connection will make input signal unstable and cause malfunction.
d) Refer to 6.2.5 Grounding for the grounding of Analog Input Modules.
Note: Isolation between Input Channels
There is no isolation provided between the various input circuit channels.
If isolation between channels is required, use a commercial isolation ampli-
fier for each channel.
5) Wiring the Analog Output Modules
a) Connecting Output Signals
(1) Connect + side of a load to “+” terminal of the Module.
(2) Connect “-” side of a load to “-” terminal of the Module.
(3) Ground the shield of a shielded twisted-pair wire at one point either on the load
side or on the Module side.
Incorrect connection may make output signal unstable and cause malfunction.
b) Grounding Shield of a Shielded Twisted-pair Wire
(1) Normally, ground the shield at one point on the load side. However, better out-
put characteristics may be obtained by grounding the shield on the Module side
rather than on the load side. Choose the best method for the situation.
(2) The FG terminal of the Module is connected to the Mounting Base via the Mod-
ule. When grounding on the Module side, use the FG terminal.
Use the terminals not connected inside the Module as relay terminals.
Incorrect connection may make output signal unstable and cause malfunction.
(3) Refer to 6.2.5 Grounding for the grounding of Analog Output Modules.