XWT-ID08 Omron, XWT-ID08 Datasheet - Page 105

• Manufacturer Part Number: XWT-ID08
• Description: SMART SLAVE EXP 8 NPN IN
• Manufacturer: Omron

Specifications of XWT-ID08

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: XWTID08

Minimizing Noise in the Network
Considerations when
Using Flat Cable
2-5-2
Problems with the
Communications
Cable Shielding
Problems with the
Communications
Power Supply
84
Correcting Malfunctions due to Noise
To prevent unstable operation due to interference when using flat cable in mul-
tiple DeviceNet systems, keep each flat cable at least 5 mm apart from any
other flat cable.
When noise is thought to be the cause of a malfunction in the DeviceNet net-
work, the following countermeasures may be effective.
Isolate the communications cable shielding wire by disconnecting it from the
ground.
Disconnecting the ground will reduce the noise transferred from the ground to
the communications cable. This countermeasure also reduces the noise cur-
rent that flows in the shield wire.
Isolate the communications power supply.
This countermeasure reduces the noise transferred from the communications
power supply ground to the communications cable and the noise current that
flows in the communications cable. A switching power supply is usually con-
nected to the case with capacitors as shown below, so the power supply itself
must be insulated from the control board as well as being disconnected from
the FG terminal.
Typical Switching Power Supply Construction
Isolating the Communications Power Supply
AC power supply
Example 1:
Isolating an S82J Power Supply
S82Y-@@N (Mounting Tool)
AC input
S82J Power Supply
Typical switching power supply construction
Switching power supply
Example 2:
Isolating another Power Supply
Power
supply
circuit
DC power supply
Insulator such as
plastic or acrylic
Case
DC output
Section 2-5