Fieldbus Modules with Multiple Thermocouple Connections
Connecting Temperature Sensors to Profibus at the Equipment
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Fieldbus Modules with Multiple Thermocouple Connections Connecting Temperature Sensors to Profibus at the Equipment
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Using the new FM3300 fieldbus modules from Beckhoff, users can
make the connection of up to either 12 or 32 thermocouples to Profibus directly in the
machine. All the electronics required for the connection is located in a compact,
watertight, industrial plug-in connector of type Han24B, meeting protection class IP 65. Designed as a cost-effective communication element for use under tough environmental conditions, the new fieldbus modules are particularly suitable for use close to the process. Up to 32 thermocouples can now be networked, via two-wire connection, in all those areas where the use of fieldbus technology has in the past been prevented by limitations of space. The compact, robust fieldbus modules (IP 65) transmit the temperature signals via an integrated Profibus DP interface with a transmission rate of 12 MBaud. Data exchange is cyclic. For the purposes of parameterisation and diagnostics the user can, however, make use of acyclic services that accord with the DPV1 standard. Additional electronic features include a microprocessor controlled, freely selectable linear temperature range, broken wire indication by LED, and cold junction compensation, so that extension cables do not falsify the result of the measurement. The electronics in the fieldbus modules has ”back-voltage protection“ for up to 230 V AC applied externally. The various implementation levels of the FM3300 fieldbus modules differ in the number of thermocouple input channels (12 channels or 32) and in the type of thermocouple implemented (J or K type).
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