8. Before closing door and reapplying AC power, be certain the battery is securely installed
in its holder..
9. When the battery in a SYSCON is removed, current date and time information is lost. If the
analyzer is configured to obtain date and time information from a central server, then it will
update automatically. If no time server is set, it will be necessary to manually set the date
and time on the analyzer.
2.4 Analog and Digital IO
How IO Channels Are Used
When low-power devices other than detectors are used either for measurements or control
functions, IO channels can be used. These fall into four categories:
Digital Inputs allow the analyzer to detect whether some device is on or off. These can be
either 'sinking' (Mode 2, the default configuration) or 'sourcing' (Mode1, used on legacy
hardware and sometimes needed for a particular application). A switch on the SIB3 and on
current IO boards selects between the two modes.
Digital Outputs are simply output relay channels that are either open or closed. These typically
enable or disable a device, turn an indicator light on or off, or select a measurement range in
a sensor.
Analog Inputs accept a variable voltage level and convert the level to a digital value that can
be used in software.
Analog Outputs convert a digital value into a variable current that can be used to control some
device or process.
SIB3-Based IO
The SYSCON2.1 has ten on-board inputs/outputs. The connectors for these are wired from
two orange connectors on the front of the SYSCON assembly cage. Switch SW3 selects sink
(Mode 2) or source (Mode 1) for the digital inputs.
IO Expansion Boards
The IO expansion boards are plugged into the SIB3 backplane. The IO card circuitry is isolated
from the connectors except for the 24v power connection on the CAN connector. The IO cards
communicate with the SYSCON over the I
2
C cable assembly. Although this cable assembly
also supplies 24v, the board is only powered from the CAN edge connector unless the IO board
is being used outside of the backplane in a special configuration.
Electronic Compartment Component Descriptions and Maintenance Procedures
2.4 Analog and Digital IO
Maxum II Reference Manual
54 Manual, 7/2017, 2000596-001
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