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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 16 / 67
2.4.5.8 Defining the Error and Warning Output of the 4-20 mA Interface
Errors and warnings can be mapped to the AO1 / AO2.
Start
register
Number of
registers
Reg1 /
Reg2
Reg3 /
Reg4
Reg5 /
Reg6
Reg7 /
Reg8
Modbus
function
code
Read
access
Write
access
4386 8 Code of
warnings
and errors
(see Figure
2.4.4.8.2)
for AO1
Current
in case of
“warning”
[mA]
for AO1
Current
in case of
“error”
[mA]
for AO1
Current in
case of
“T exceed”
[mA]
for AO1
3, 4, 16 U/A/S S
4514 8 Code of
warnings
and errors
(see Figure
2.4.4.8.2)
for AO2
Current
in case of
“warning”
[mA]
for AO2
Current
in case of
“error”
[mA]
for AO2
Current in
case of
“T exceed”
[mA]
for AO2
3, 4, 16 U/A/S S
Figure 2.4.5.8.1: Definition of register 4386 / 4514.
Bit # Code (hex) Behaviour of the 4-20 mA interface in case of errors and warnings
0 (LSB) 0x000001 Error continuous output
not available
16 0x010000 Warning continuous output
not available
Figure 2.4.5.8.2: Code for the 4-20 mA interface in case of errors and warnings.
If the corresponding bits for the errors and warnings are not set (=0x00), the respective options are
inactive.
The default settings are:
Code 0x01
current in case of warnings: 3.5 mA
current in case of errors: 3.5 mA
current in case of temperature exceed: 3.5 mA
Command: ErrorWarnings AO1
Modbus address: 4386 Length: 8 Type: 3
Read
Parameter: Warning code Current in case of
warning
[mA]
Current in case of
error
[mA]
Current in case of
temperature exceed
[mA]
Format: Hex Float Float Float
Value:
0x010001 3.5 3.5 3.5
Figure 2.4.5.8.4: Example: Read the settings for AO1 in case of warnings and errors. Warning code
0x010001 corresponds to the continuous output current in case of warning (0x010000) and
continuous output current in case of error (0x01) of 3.5 mA. The output current in case of
temperature exceed is 3.5 mA.