Hardware Reference Manual
Machine Connections
9
MACHINE CONNECTIONS
Typically, the user connections are actually made to terminal blocks that are attached to the JMACH
connectors by a flat cable. The following are the terminal blocks recommended for connections:
•
34-Pin IDC header to terminal block breakouts (Phoenix part number 2281063) Delta Tau
part number 100-FLKM34-000
•
50-Pin IDC header to terminal block breakouts (Phoenix part number 2281089) Delta Tau
part number 100-FLKM50-000
Mounting
The PMAC2A PC/104 is always installed either using standoffs, when it is
stacked to a PC/104 computer or used as a stand-alone controller. At each of
the four corners of the PMAC2A PC/104 board, there are mounting holes that
can be used to mount the board on standoffs.
The PMAC2A PC/104 baseboard is placed always at the bottom of the stack.
The order of the Acc-1P or Acc-2P with respect to the baseboard does not
matter.
Power Supplies
Digital Power Supply
3A @ +5V (±5%) (15 W)
(Eight-channel configuration, with a typical load of encoders)
The PMAC2A PC/104, the Acc-1P and the Acc-2P each require a 1A @ 5VDC power supply for
operation. Therefore, a 3A @ 5VDC power supply is recommended for a PMAC2A PC/104 board stack
with Acc-1P and Acc-2P boards.
•
The host computer provides the 5 Volts power supply in the case PMAC is installed in the
PC/104 bus. With the board stack into the bus, it will automatically pull +5V power from the
bus and it cannot be disconnected. In this case, there must be no ex5V supply, or the
two supplies will "fight" each other, possibly causing damage. This voltage could be
measured on the TB1 terminal block or the JMACH1 connector.
•
In a stand-alone configuration, when PMAC is not plugged in a computer bus, it will need an
external 5V supply to power its digital circuits. The 5V power supply can be brought in
either from the TB1 terminal block or from the JMACH1 connector.
DAC Outputs Power Supply
0.3A @ +12 to +15V (4.5W)
0.25A @ -12 to -15V (3.8W)
(Eight-channel configuration)
•
The host computer provides the ±12 Volts power supply in the case PMAC is installed in the
PC/104 bus. With the board stack into the bus, it will pull ±12V power from the bus
automatically and it cannot be disconnected. In this case, there must be no external ±12V
supply, or the two supplies will fight each other, possibly causing damage. This voltage
could be measured on the TB1 terminal block.
•
In a stand-alone configuration, when PMAC is not plugged in a computer bus, it will need an
external ±12V supply only when the digital-to-analog converter (DAC) outputs are used. The
±12V lines from the supply, including the ground reference, can be brought in either from the
TB1 terminal block or from the JMACH1 connector.
Baseboard mounted at
the bottom of the stack
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