Delta Tau Universal PMAC Lite, Hardware Reference Manual

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Universal PMAC Lite
4 Introduction
J5 - General-Purpose Digital Inputs and Outputs (JOPTO Port)
PMAC's JOPTO connector provides eight general-purpose digital inputs and eight general-purpose digital
outputs. Each input and each output has its own corresponding ground pin in the opposite row. The 34-pin
connector was designed for easy interface to OPTO-22 or equivalent optically isolated I/O modules. Acc-
21F is a six-foot cable for this purpose.
J6 - Auxiliary I/O Port Connector (JXIO Port)
This connector is used for miscellaneous I/O functions related to expansion cards that are used with PMAC.
J7 - A/D Port Connector (JS1 Port)
This connector is used for bringing the signals from an Acc-28A or an Acc-28B analog to digital converter
accessory board.
J8 - Position-Compare Connector (JEQU Port)
This connector provides the position-compare outputs and the amplifier enable outputs for the four servo
interface channels. The PMAC position-compare feature changes an external signal when the associated
encoder counter reaches a programmable position. In this way, events can be triggered to happen on the
actual position of the system. Because the triggering is a pure hardware function (although setup is
software), it is very fast and accurate. The signal can be used to trigger an action in the host computer, in
the plant, or in PMAC itself.
J11 - Machine Connector (JMACH Connector)
Since the PMAC Lite is limited to four on-board axes, it has only one JMACH machine interface connector,
which is labeled J11. This connector contains the pins for four channels of machine I/O: analog outputs,
incremental encoder inputs, and associated input and output flags, plus power-supply connections.
TB1 – Power Supply Terminal Block
This terminal block can be used to provide the input for the power supply for the circuits on the PMAC Lite
board when it is not in a bus configuration.
LED Indicators
The PMAC Lite has three LED indicators: red, yellow, and green. When the green LED is lit, this indicates
that power is applied to the +5V input; when the red LED is lit; this indicates that the watchdog timer has
tripped and shut down the PMAC.
The yellow LED located beside the red and green LEDs, when lit, indicates that the phase-locked loop that
multiplies the CPU clock frequency from the crystal frequency on the Option CPU is operational and stable.
This indicator is for diagnostic purposes only; it may not be present on your board.
Fuse
The 5V output through the J5 JOPTO connector is protected by F1, a 2-Amp fuse.
PMAC System Configuration Incompatibilities
In general, PMAC, its options, and its accessories can be mixed and matched at will. However, some
combinations are not permissible. These combinations are listed below.
JEXP Expansion Port Accessories
Acc-24P/V and Acc-29P/V may not be used on the same PMAC due to addressing conflicts. To interface
with MLDT feedback devices the PMAC2 controller is recommended instead of the PMAC1 and Acc-
29P/V combination.
The PMAC can interface with two off-board DSPGATEs. The Acc-24P/V can have
either only one DSPGATE or a second DSPGATE when Acc-24P/V Option 1 is ordered. The Acc-51P can
have only one DSPGATE.