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Focus on DCS, PLC, robot control system and large servo system.
Main products: various modules / cards, controllers, touch screens, servo drivers.
Advantages: supply of imported original products, professional production parts,
Fast delivery, accurate delivery time,
The main brands include ABB Bailey, Ge / fuanc, Foxboro, Invensys Triconex, Bently, A-B Rockwell, Emerson, ovation, Motorola, xyvom, Honeywell, Rexroth, KUKA, Ni, Deif, Yokogawa, Woodward, Ryan, Schneider, Yaskawa, Moog, prosoft and other brands
| PR937620 |
IThe operator panel has galvanic isolation against the 24 V DC feed but no galvanic isolation between the communication ports for RS232, RS422/485 and USB. Only the Ethernet connection has galvanic isolation. When a PC is connected to the panel, the panel’s internal 0 V (GND) will be connected to the protective ground via the PC. A number of USB devices can have the shield connected together with the protective ground. Here, the panel’s 0 V (GND) is connected to the protective ground when, for example, a USB memory stick, keyboard or similar device is plugged in. If a number of units are connected that have a 0 V and a ground connection, and these are connected to various grounding points, there is a substantial risk of 5356 Internal electronic Filter DC/DC galvanic isolation 1.5 m VCC 0 V (GND) Ethernet DC/AC CFL 0 V +24 V DC RS422/485 RS232 USB USB * * * * * * * * 5357 * Operator panel Modular controller PC RS422 RS232 USB Power CPU COM COM2 Not same ground potential PC Printer * = Internal 0 V (GND) connection Section 7 Additional Installation Tips Cable and Bus Termination RS485 3BSE043446R501 51 problems. Grounding currents go through communication cables, the rear plate of the controller, and internally in the operator panel, and can cause errors. Use external units to improve communication and achieve galvanic isolation. Westermo has good industry-standard insulators that are also insulated from the 24 V DC feed. Cable and Bus Termination RS485 • Use shielded and twisted pair cable. The pair capacitance may not exceed 52.5 pF/m and area at least 0.25 mm2 (AWG 24), if you want to use the maximum transfer distance and maximum transfer speed. • 0 V, the reference voltage for communication should be included in the cabling. With two-way communication use two pairs; one pair for communication and one pair for 0 V. • The shield must be grounded at one end. The other end is usually grounded, but with longer distances or when there is a difference in the ground potential, the shield should be connected to the ground via 0.1 uF/250 V plastic capacitor to prevent ground current in the braided shield. A number of manufacturers recommend that the shield be grounded at each node. Various manufacturers have different systems for bus termination. The RS485 standard does not describe how the “Fail Safe” function would be carried out, just that the system should be able to handle the error. It is very important to make sure that the 24 V feed in the external insulation unit is not connected to one of the communication outlets. If it does not have 100% insulation against the 24 V feed, disturbances and grounding currents from the 0 V on the 24 V side will disrupt communication. Using this type of unit solves one problem but creates a larger problem! A substandard installation may work now, but problems may arise when other devices are connected.e
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