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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 63 / 67
Command: SIP definition
Modbus address: 4988 Length: 8 Type: 16
Write
Parameter: T min [°C] T max [°C] Time min [min] Empty
Format: Float Float Float Float
Value:
120 130 30 0
Figure 2.8.5.3: Example to write the SIP definitions.
Command: SIP definition
Modbus address: 4988 Length: 8 Type: 3
Read
Parameter: T min [°C] T max [°C] Time min [min] Empty
Format: Float Float Float Float
Value:
120 130 30 0
Figure 2.8.5.4: Example to read the SIP definitions.
Command: CIP definition
Modbus address: 4996 Length: 8 Type: 16
Write
Parameter: T min [°C] T max [°C] Time min [min] Empty
Format: Float Float Float Float
Value:
80 100 30 0
Figure 2.8.5.5: Example to write the CIP definitions.
Command: CIP definition
Modbus address: 4996 Length: 8 Type: 3
Read
Parameter: T min [°C] T max [°C] Time min [min] Empty
Format: Float Float Float Float
Value:
80 100 30 0
Figure 2.8.5.6: Example to read the CIP definitions.
2.8.6 Reading the Sensor’s Quality Indicator
In register 4872 the sensor’s quality indicator (0-100%) is given.
Start
register
Number of
registers
Reg1 / Reg2
(Float)
Modbus
function
code
Read
access
Write
access
4872 2 Quality [%] 3, 4 U/A/S none
Figure 2.8.6.1: Definition of register 4872.
Command: Quality indicator
Modbus address: 4872 Length: 2 Type: 3
Read
Parameter: Quality [%]
Format: Float
Value:
100
Figure 2.8.6.2: Example to read the sensor’s quality indicator.
The sensor’s quality indicator is influenced by:
Offset a pH 7
Slope
Errors