LC700- Manual de instalação
4.11
Ferrite Beads
Ferrite beads can supply additional suppression for EMI transients. The Ferrite of Fair-Rite Products
Corporation (ordering code 2643626502) can be used in category 2 and 3 conductors. We can
install them using fastening belts. With a ferrite located close to the cable termination,, EMI
transients induced on the cable can be suppressed by the ferrite, before entering in the equipment.
Control
Circuit
Noise
Brush
Motor
Electronic Device
Preventive Application
One or two Turns
Figure 4.11 – Ferrite Application on Control Lines
EIA-485 in LC700
The LC700 CPU uses RS-485 on ports P2 and P3 in the CPU-700 module. P2 Port is always
Modbus Slave RTU while P3 can be used as Modbus Slave RTU, or the master of a remote
interfaces network (RIO-700) with higher communication rates.
The CPU700 has 3 terminals for each P2 and P3 ports. Both are isolated from each other and from
the CPU digital circuit. This means that the reference of the communication drive, internally is not
connected with the housing ground nor with any CPU Internal reference. Consequently, the
interface is completely isolated.
A special attention should be given to the network physical installation to obtain good performance,
and at the same time, to prevent noises that can damage the normal operation of the connected
equipments.
Other Recommendations:
EIA-485
1. Wire connection in an EIA-485 network
The third wire should be connected to the references of all the connected drives. If the reference
terminal is not connected, the drives’ reference will float, and the data transmission will be more
vulnerable to the noise. The Figure 4.12 below shows the correct way to interconnect the ports
P2 and P3 on an EIA-485 network.
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