PMAC-Lite Hardware Reference
Introduction
3
Option 14: Replacement of flag Opto-Isolators with Socketed Shunts
Normally, the flag inputs on all servo channels have opto-isolator circuits that require 12 to 24V inputs to
turn on. When the ACC-8D Option 8 Analog Encoder Interpolator is used on a pair of channels, it uses
the flag inputs on the second (even-numbered) channel to provide “sub-count” information at 5V levels
referenced to digital ground.
Option 14
replaces the opto-isolators on the even-numbered channels of PMAC-Lite with socketed
shunts that permit the input of 5V non-isolated signals from the ACC-8D Option 8 board.
Option 15: V-to-F Converter for Analog Input
The JPAN control panel port on the PMAC-Lite has an optional analog input called WIPER (because it is
often tied to a potentiometer’s wiper pin). PMAC-Lite can digitize this signal by passing it through an
optional voltage-to-frequency converter, using E-point jumpers to feed this into the Encoder 4 circuitry
(no other use is then permitted), and executing frequency calculations using the “time base” feature of the
encoder conversion table.
Option 15
provides a voltage-to-frequency converter that permits the use of the WIPER input on the
control panel port.
Option 16: Battery-Backed Parameter Memory
The contents of the main flash-backed memory (components U7, U10, and U16) of the PMAC1.5-Lite are
not retained through a power-down or reset unless they have been saved to flash memory first. Option 16
provides supplemental battery-backed RAM for real-time parameter storage that is ideal for holding
machine-state parameters in case of an unexpected power-down. It can only be used when the main
memory is flash-backed.
Option 16
provides a 16k x 24 bank of battery-backed parameter RAM in components U6, U9, U15
(smaller than the full footprint), with the battery in BT1.
Hardware Updates
Significant upgrades were made to the PMAC-Lite board in the 602402-102 version. This new version
replaces earlier versions of the 602402 board (PMAC1.5-Lite – flash-backed memory), and the 602399
board (PMAC(1)-Lite – battery-backed memory). The ability to configure 602402-102 (and newer) in
either battery-backed or flash-backed memory configurations leads to it being called the “Universal”
PMAC-Lite.
Improvements on the Universal PMAC-Lite include:
•
Universality.
Formerly different board designs were used for battery-backed (602399-10x) and
flash-backed (PMAC1.5-Lite: 602402-101) versions of the PMAC-Lite. Now both configurations
can be built on the same board, for cost savings that are passed on to you.
•
80-MHz CPU.
The new PMAC-Lite supports the Option 5C 80 MHz CPU for high-end operations.
•
Supplemental Battery-Backed Parameter Memory.
The new PMAC-Lite supports the Option 16
supplemental battery-backed parameter memory when the main memory is flash-backed.
•
On-board Dual-Ported RAM.
The new PMAC-Lite has optional on-board dual-ported RAM,
whereas the old PMAC-Lite required a separate board. On-board DPRAM saves an expansion slot
and is less expensive.
•
Raised Bottom Edge.
The bottom edge of the board has been raised so that it can clear high-profile
parts on the PC motherboard – up to 25mm (1 inch) high.
•
Standard RS-422 Serial Port.
An RS-422 serial interface, which formerly required the Option 9L
piggyback board, now is standard. Jumpers E107 and E108 select between the RS-232 port and the
RS-422 port.
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