Endress+Hauser Proline t-mass 65 PROFIBUS DP, Руководство по эксплуатации

Страница: 59 / 106

Proline t-mass 65 PROFIBUS DP Commissioning
59
6.6.3 Description of the modules
AI (Analog Input) module
The AI module (slots 1...3) cyclically transmits the corresponding measured variable, including
the status, to the PROFIBUS Master (class 1). The measured variable is represented in the first
four bytes in the form of floating point numbers in accordance with the IEEE 754 standard.
The fifth byte contains standardized status information corresponding to the measured variable.
Further information on the device status
→
Page 73.
Input data
Assignment of the measured variables to the AI module
The AI module can transmit different measured variables to the PROFIBUS Master (class 1).
The measured variables are assigned to the Analog Input function blocks 1 to 3 by means of the
local display or with the aid of an operating program (e.g. FieldCare) in the CHANNEL function:
• COMMUNICATION
→
BLOCK SELECTION: Selection of an Analog Input function block
• COMMUNICATION
→
CHANNEL: Selection of a measured variable
Possible settings
Factory setting
TOTAL module
The measuring device has three totalizer function blocks. The totalizer values can be cyclically
transmitted to the PROFIBUS Master (class 1) via the TOTAL module (slots 4 to 5). The totalizer
value is represented in the first four bytes in the form of a floating point number in accordance with
the IEEE 754 standard. The fifth byte contains standardized status information corresponding to the
totalizer value. Further information on the device status
→
Page 73.
Input data
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
measured variable (IEEE 754 floating point number) Status
Measured variable ID for CHANNEL function
MASS FLOW 277
CORR. VOLUME FLOW 398
TEMPERATURE 285
Module Analog Input
function block
Measured variable ID for CHANNEL function
AI (slot 1) 1 MASS FLOW 277
AI (slot 2) 2 CORR. VOLUME FLOW 398
AI (slot 3) 3 TEMPERATURE 285
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Totalizer value (IEEE 754 floating point number) Status