42/24-10 EN Rev. 9 Appendix 1: Gas Analyzer Overview A-1-3
Electronics Module
System Controller The system controller carries out the following functions:
• Processing and communicating the measurement values supplied by the
analyzer module sensor electronics
• Compensating the measurement values, e.g. cross-sensitivity correction
• Controlling system functions, e.g. calibration
• Display and control functions
• Controlling associated devices, e.g. system components for sample gas
conditioning
• Communication between the gas analyzer and external systems
The system controller communicates with the other AO2000 units (e.g. the
analyzer modules) via the system bus.
The interfaces for controlling associated systems and for communicating with
external systems are located on the system controller (Ethernet 10 /100/1000-
BASE-T interfaces) and on the I/O modules.
I/O Modules The I/O modules are attached and directly connected to the system controller
board.
There are various types of I/O modules:
• The 2-way analog output module has two analog outputs.
• The 4-way analog output module has four analog outputs.
• The 4-way analog input module has four analog inputs.
• The digital I/O module has four digital inputs and four digital outputs.
• The Modbus module has one RS485 and one RS232 interface.
• The Profibus module has one RS485 and one MBP interface (non-intrinsically
safe).
I/O Devices The I/O board in the SCC-F Sample Gas Feed Unit is used for connection of
sample gas conditioning devices.
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