Burkert Type MS01, Operating Instructions Manual, Page: 63 / 88

63
Process Data Objects
16 proceSS dATA objecTS
The participants to büS or to a CANopen fieldbus use process data objects (PDOs) to communicate the
cyclic data.
16.1 Transmitted PDOs
The PDOs that are transmitted by the product are described in Table 17 . The structure of the PDO4 is
detailed in chpt. 16.3.
Table 17: PDOs transmitted by the product
Number name Index Data type Unit SI Range Precision
PDO1
pH 0x2500 REAL32 pH pH -2...16 0,1
pH voltage 0x2501 REAL32 V -2,5...2,5 V 1,0 E-4
PDO2
Impedance of the
reference electrode
0x2504 REAL32
W
0...1 M
W
1000
Leakage current of the
measuring-cell sensor
(ISFET)
0x2505 REAL32 A - 1.0 E-8
PDO3
Temperature of the water
sample
0x2502 REAL32 K 233...398 K 0,05
PDO4 pH State 0x2503 UNSIGNED8 - - -
16.2 Received PDOs
The PDOs that are received by the product are described in Table 18 .
Table 18: PDOs received by the product
Number name Index Data type Unit SI Range
PDO1 Hold 0x2540 UNSIGNED8 - -
16.3 Structure of the PDO4
pH State
The PDO4 uses 1 byte. The PDO4 indicates whether the product is working correctly or not. Additionnally,
the PDO4 indicates the events that have been generated by the product.
Table 19: Bit distribution of the PDO4 - pH State
Status bits
7 6 5 4 3 2 1 0
English
Type MS01