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Correct Positioning with RFID in Carbid Production

Turck’s RFID system ensures correct positioning of the charging carriage in the dust-laden heat of a Chinese carbide production plant

The position of the charging carriage in a Chinese production plant was previously determined by an encoder on the carriage wheel. However, this information became increasingly incorrect due to slippage during acceleration and braking, making it necessary to carry out manual position corrections. Today, the manufacturer measures the position using RFID tags on the carriage and a read/write head on the transport rail. This enables the carriage to be reliably positioned in front of the charging door. Neither the IP67 read/write head nor the robust tags are damaged by the dust and heat from the production process. Today the plant operates with greater energy and consumption efficiency, while employees work in a safer environment.

  • The correct position of the charging carriage is detected with RFID, eliminating the problem of slippage

  • BL20 gateway provides communication to the controller, the RFID-S slice module enables simple connection

  • TN-80 readers have degree of protection IP67, an extended temperature range and large read/write ranges

Alignment of the charging carriage error prone

A Chinese carbide producer urgently had to optimize its production process. A rail-guided carriage for feeding the raw material in the carbide furnace has to be correctly aligned to the charging door. With the previous solution, the position was measured using an encoder. However, the frequent acceleration, deceleration and braking of the carriage can cause this to slip a little. The slippage distance is not measured by the encoder, so that the encoder’s position data is no longer correct. This resulted in the carriage no longer being aligned to the charging door.

In this case, personnel are required to make a manual intervention. However, the area surrounding the charging door is very hot since the furnace is situated directly beneath it. It is a dust laden, highly flammable and explosive environment. The severe conditions present in this area mean that personnel have to wear protective equipment and are exposed to a considerable safety risk.

The plant owner therefore chose an RFID solution for positioning the charging carriage. The solution essentially consists of three tags fitted on the charging carriage: one at the opening of the carriage, and one each at a specific distance in front of and behind the opening in order to indicate the position. A read/write head is positioned on the rail at the position of every charging door. The correct position of the carriage is guaranteed by the reliable RFID positioning system. Any manual corrections and the associated inconvenience are thus considerably reduced.

Solution concept with BL ident

As the customer uses a Supcon process control system, an RS485 interface is already provided at the installation site. Turck therefore supplied a BL20 fieldbus gateway which supports RS 232/RS485. The customer requires no programming in the PLC for S-Interface. The RFID interfaces can be used as conventional inputs. The read/write heads with degree of protection IP67 are suitable for use at temperatures from -25 to +70 °C and can be fitted directly at the installation site. The tags are made from epoxy resin and are extremely robust. Even if the surface is scratched or dirty, its function is not impaired.


Through the use of Turck’s BL ident RFID system, the operator could increase the production capacity of the plant and make considerable improvements in terms of energy savings, reduced consumption and safety at the same time.

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