PMAC-Lite Hardware Reference
Introduction
1
INTRODUCTION
Overview
The PMAC-Lite is a member of the PMAC(1) family of boards optimized for interface to traditional
servo drives with single analog inputs representing velocity or torque commands. Its software is capable
of eight axes of control. It has four channels of on-board axis interface circuitry. It can also support up to
8 channels of off-board axis interface circuitry through its expansion port, connected to an ACC-24P
board.
The PMAC-Lite is a full-sized ISA-bus expansion board. While the PMAC-Lite is capable of ISA bus
communications, with or without the optional dual-ported RAM, it does not need to be inserted into an
ISA expansion slot. Communications can be done through an RS-232 or RS-422 serial port; standalone
operation is possible.
The new “Universal” PMAC-Lite board replaces the previous PMAC-Lite board with battery-backed
RAM and the PMAC1.5-Lite board with flash-backed RAM. The Universal PMAC-Lite can be built to
use either type of memory.
Board Configuration
Base Version
The base version of the PMAC-Lite provides a 1-slot board with:
•
20 MHz DSP56002
•
128k x 24 SRAM active memory
•
Battery-backup circuitry for SRAM (PMAC-Lite)
•
128k x 8 EPROM for firmware (PMAC-Lite)
•
512k x 8 flash memory for SRAM backup & firmware (PMAC1.5-Lite)
•
Latest released firmware version
•
RS-232/422 serial interface, ISA (PC) bus interface
•
Four channels axis interface circuitry, each including:
•
16-bit +/-10V analog output
•
3-channel differential/single-ended encoder input
•
Four input flags, two output flags
•
Interface to external 16-bit serial ADC
•
Display, control panel, muxed I/O, direct I/O interface ports
•
PID/notch/feedforward servo algorithms
The unit has a 1-year limited warranty from date of shipment, and includes one manual per set of one to
four PMACs in shipment.
Cables, mounting plates, and mating connectors are not included.
If the PMAC(1)-Lite version (battery-backed memory) of the board is ordered, the standard configuration
will have SRAM ICs in U6, U9, and U15, filling the full footprint, and a battery in BT1. There will be no
SRAM ICs in U7, U10, and U16. There will be an EPROM IC in the U5 socket.
If the PMAC1.5-Lite version (flash-backed memory) of the board is ordered, the standard configuration
will have SRAM ICs in U7, U10, and U16. There will be a flash-memory IC in the U5 socket. There
will be no SRAM ICs in U6, U9, and U15, and no battery in BT1, unless Option 16 is ordered.
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