ABB LGR-ICOS GLA531 Series - Page 37

Operating Manual
3KXG165002R4201_2021_04 ABB PROPRIETARY INFORMATION 37
GLA531 Series LGR-ICOS™ Gas Analyzer
Table 5 Modbus Gas Concentration Line Setting
Input Lines Analog Input Descriptions
AI0+
Temperature Warning/Alarm
AI0–
AI1+
Analyzer Health Warning/Alarm
AI1–
AI2+
Gas #1 Concentration
AI2–
AI3+
Gas #2 Concentration
AI3–
AI4+
Gas #3 Concentration
AI4–
AI5+
Gas #4 Concentration
AI5–
The gas measurement outputs from the analyzer computer are single-ended analog signals in a 0-to-5 V DC
range. These analog signals are scaled linearly to the gas concentration measurements in ppm values. 0 volts
represents 0 ppm, and 5 volts represents the maximum gas concentration value in the measurement range. This
5 volts value matches the number set in the Setup à 4-20 mA screen, as shown in Figure 28.
Real-time warning and alarm status signals are also conversions from the single-ended 0-to-5 V DC analog
signals. 0 volt is equal to 4 mA, and 5 volts is equal to 20 mA. Refer to Table 8 and Table 9.
When connecting to the device using the Modbus TCP Protocol, refer to Table 6 for a list of parameters. For
additional information on the Moxa ioLogik E1240, refer to the Moxa User Manual in the User Manual disk
provided with the instrument.
Table 6 Modbus ioLogic E1240 Default Settings
Parameters Default Settings
IP Address
192.168.127.254
Modbus port
502
Device ID
1
Starting register
1
Number of registers
24
Read-Only Registers:
• Each channel is output on two registers with different formats
• Registers 1 - 8 are integers where 32767 is the full scale (FS)
• Registers 9 - 24 are floating point with the least-significant bit first (LSBF)