Reference Manual

PMAC-PCI Hardware Reference
Machine Connection 27
MACHINE CONNECTIONS
Typically, the user connections are actually made to a terminal block that is attached to the JMACH
connector by a flat cable (Acc-8D or 8P). The pinout numbers on the terminal block are the same as
those on the JMACH connector. The possible choices for breakout boards are the following:
Board Mounting Breakout Style Breakout Connector Notes
Acc-8P DIN – Rail Monolithic Terminal Block Simple Phoenix contact board
Acc-8D DIN – Rail Monolithic Terminal Block
Headers for connection to option
boards
Acc-8DCE DIN – Rail Modular D-sub connector
Fully shielded for easy CE mark
compliance
Acc-8DP Panel Modular D-sub connector Used in the PC-pack product
Mounting
The PMAC PCI can be mounted in one of two ways: in the PCI bus, or using standoffs.
PCI bus: To mount in the PCI bus, simply insert the P1 card-edge connector into PCI socket. If there is a
standard PC-style housing, a bracket at the end of the PMAC PCI board can be used to screw into the
housing to hold the board down firmly.
• Standoffs: At each of the four corners of the PMAC PCI board, there are mounting holes that can be
used to mount the board on standoffs.
Power Supplies
Digital Power Supply
2A @ +5V (+/-5%) (10 W)
(Eight-channel configuration, with a typical load of encoders)
•
The host computer provides the 5 Volts power supply in the case PMAC is installed in its internal
bus.
With the board plugged into the bus, it will pull +5V power from the bus automatically and it cannot be
disconnected. In this case, there must be no external +5V supply or the two supplies will fight each other,
possibly causing damage. This voltage could be measured between pins 1 and 3 of the terminal block.
• In a stand-alone configuration, when PMAC is not plugged in a computer bus, it will need an external
five-volt supply to power its digital circuits. The +5V line from the supply should be connected to
pin 1 or 2 of the JMACH connector (usually through the terminal block), and the digital ground to pin
3 or 4. Acc-1x provides different options for the 5V power supply.
Analog Power Supply
0.3A @ +12 to +15V (4.5W)
0.25A @ -12 to -15V (3.8W)
(Eight-channel configuration)
The analog output circuitry on PMAC is optically isolated from the digital computation circuitry, and so
requires a separate power supply. This is brought in on the JMACH connector. The positive supply –
+12V to +15V – should be brought in on the A+15V line on pin 59. The negative supply – 12 to -15V –
should be brought in on the A-15V line on pin 60. The analog common should be brought in on the
AGND line on pin 58.