Hardware Description: Basic System
The Main Board
Thermo Fisher Scientific
AutoPILOT PRO Flow Computer User Guide 2-7
Typical connections are shown below.
Figure 2–5. Typical RTD connections
Two local discrete outputs are provided on the main board at TB5 to drive
customer low-power output devices that are DC-resistive by nature (relays,
solenoids, etc.). The discrete outputs also provide a +12 V power source at
TB5 pins 1 and 3 (V
DO
) to drive the customer's device. Each channel can
provide 150 mA maximum.
Power for each discrete output may be customer supplied and is
independent of the flow computer's input power. Each signal provided by
the board is an open drain FET output contact closure detected as a level
signal. Some optional functions, the +12 V radio power supply output
(VRadio1 at TB12) for example, may require the internal use of one or
more of the discrete outputs, making them unavailable for customer use.
The discrete outputs on the main board are shown below.
Table 2–3. Discrete outputs on the main board
Output
SIG
GND
DO1
TB5-2
TB6-2 or TB6-4
DO2
TB5-4
TB6-2 or TB6-4
VDO (12 V)
TB5-1 or TB5-3
TB6-2 or TB6-4
Discrete Outputs
