Hardware Reference Manual
4
Hardware Setup
INTRODUCTION
The PMAC2A PC/104 motion controller is a compact, cost-effective version of Delta Tau’s PMAC2
family of controllers. The PMAC2A PC/104 can be composed of three boards in a stack configuration.
The baseboard provides four channels of either DAC ±10V or pulse and direction command outputs. The
optional axis expansion board provides a set of four additional servo channels and I/O ports. The optional
communications board provides extra I/O ports and either the USB or Ethernet interface for faster
communications.
Acc-1P: Axis Expansion Piggyback Board
Acc-1P provides four additional channels axis interface
circuitry for a total of eight servo channels, each including:
•
12-bit ±10V filtered PWM analog output
•
Pulse-and-direction digital outputs
•
3-channel differential/single-ended encoder input
•
Four input flags, two output flags
•
Three PWM top-and-bottom pairs (unbuffered)
Acc-1P Option 1: I/O Ports
Option 1 provides the following ports on the Acc-1P axes
expansion board for digital I/O connections.
PMAC2A PC/104 Base Board shown
stacked with the Acc-1P axes
•
Multiplexer Port: This connector provides eight input lines and eight output lines at TTL levels.
When using the PMAC Acc-34x type boards these lines allow multiplexing large numbers of inputs
and outputs on the port. Up to 32 of the multiplexed I/O boards may be daisy-chained on the port, in
any combination.
•
I/O Port: This port provides eight general-purpose digital inputs and eight general-purpose digital
outputs at 5 to 24Vdc levels. This 34-pin connector was designed for easy interface to OPTO-22 or
equivalent optically isolated I/O modules when different voltage levels or opto-isolation to the
PMAC2A PC/104 is necessary.
•
Handwheel port: this port provides two extra channels, each jumper selectable between encoder input
or pulse output.
Acc-1P Option 2: Analog-to-Digital Converters
Option 2 permits the installation on the Acc-1P of two channels of analog-to-digital converters with ±10V
input range and 12-bits resolution. The key component installed with this option is U20.
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