Thermo Scientific 5028i Instruction Manual page 228

System Description
I/O Components
I/O Expansion Board
Front Panel Connector
I/O Components
Analog Voltage Outputs
8-8 Model 5028i Instruction Manual
The I/O expansion board connects to the motherboard and adds the
capability to input external analog voltage signals and to output analog
(Optional)
currents via a connector located on the rear panel of the instrument. It
contains local power supplies, a DC/DC isolator supply, a sub-processor
and analog circuits. Eight analog voltage inputs are provided with an
input voltage range of 0V to10 VDC. Six current outputs are provided
with a normal operating range of 0 to 20 mA.
The front panel connector board interfaces between the motherboard
and the function key panel and graphics display. It serves as a central
Board
location to tie the three connectors required for the function key panel,
the graphics display control lines, and the graphics display backlight to a
single ribbon cable extending back to the motherboard. This board also
includes signal buffers for the graphics display control signals and a high
voltage power supply for the graphics display backlight.
External I/O is driven from a generic bus that is capable of controlling
the following devices:
Analog output (voltage and current)
l
Analog input (voltage)
l
Digital output (TTL levels)
l
Digital input (TTL levels)
l
Note The instrument has spare solenoid valve drivers and I/O support
for future expansion.
The instrument provides six analog voltage outputs. Each may be
firmware configured for any one of the following ranges, while
maintaining a minimum resolution of 12 bits:
0-100 mV
l
0-1 V
l
0-5 V
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0-10 V
l
The user can calibrate each analog output zero and span point through
the firmware. At least 5% of full-scale over and under range are also
supported, but may be overridden in the firmware, if required.
The analog outputs may be assigned to any measurement or diagnostic
channel with a user-defined range in the units of the selected parameter.
The voltage outputs are independent of the current outputs.
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