Siemens SITRANS RD500 Manuale di istruzioni per l'uso - Pagina 28

Sfoglia online o scarica il pdf Manuale di istruzioni per l'uso per Interruttore Siemens SITRANS RD500. Siemens SITRANS RD500 48. Configuring sitrans rd500 for connection to multiranger with modbus rtu
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Application Example

The PV reading from a thermocouple is 3 degrees lower than the actual temperature

when the process is at +200 degrees. It reads only 1 degree lower than the actual

temperature when the process is at +300 degrees.

Desired PV = (PV x Slope) + Offset

Slope = 300-200

299-197

Offset = 200 - (0.980 x 197) = 6.940

A Slope value of 0.980 and an Offset value of 6.940 corrects the sensor error.

Below, see how to add I/O data that originates from external serial Modbus devices. This

allows the RD500's capabilities to be extended to any device equipped with a serial port

and that supports the Modbus RTU slave protocol.

For more information regarding the serial connectivity of the RD500, refer to the

hardware manual found at www.siemens.com/sitransRD500.

After adding each Modbus device, click Apply, and the next device field will become

available.

Driver Settings

•

Protocol Type: Selects Modbus protocl: RTU or ASCII

•

RTU Framing: Detect via Timing and Track Frame Contents options

•

Slave Response Timeout: The time in milliseconds (mS) that the Modbus master

allows the Modbus slave device to respond. If the Modbus master does not receive

a response from the slave in the specified time, the master will enter a timeout error

in the event log.

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SITRANS RD500 – OPERATING INSTRUCTIONS

= 0.980

7ML19985MA01