User`s manual

1.0 - Introduction to PMAC
Page - 5
1.4 – PMAC(1) connectors and indicators
1.4.1 – Display Port Outputs (JDISP Port)
The JDISP connector (J1) allows connection of the ACC-12 or ACC-12A liquid crystal displays, or of the ACC-12C
vacuum fluorescent display. Both text and variable values may be shown on these displays through the use of the
DISPLAY command, executing in either motion or PLC programs.
1.4.2 – Control-Panel Port I/O (JPAN Port)
The JPAN connector (J2 on PMAC-PC, -Lite, -VME, and top board of PMAC-STD) is a 26-pin connector with dedicated
control inputs, dedicated indicator outputs, a quadrature encoder input, and an analog input. The control inputs are low-true
with internal pull-up resistors. They have predefined functions unless the control-panel-disable I-variable (I2) has been set
to 1. If this is the case, they may be used as general-purpose inputs by assigning M-variable to their corresponding memory-
map locations (bits of Y address $FFC0).
1.4.3 – Thumbwheel Multiplexer Port I/O (JTHW Port)
The Thumbwheel Multiplexer Port, or Multiplexer Port, on the JTHW (J3) connector has eight input lines and eight output
lines. The output lines can be used to multiplex large numbers of inputs and outputs on the port, and Delta Tau provides
accessory boards and software structures (special M-variable definitions) to capitalize on this feature. Up to 32 of the
multiplexed I/O boards may be daisy-chained on the port, in any combination.
1.4.4 – Serial Port Connection
For serial communications, use a serial cable to connect your PC's COM port to the PMAC's serial port connector (J4 on
PMAC-PC, -Lite, and -VME; J1 on PMAC-STD's bottom board). Delta Tau provides cables for this purpose: accessory 3D
connects PMAC-PC or -VME to a DB-25 connector; ACC-3L connects PMAC-Lite to a DB-9 connector; and ACC-3S
connects PMAC-STD to a DB-25 connector. Standard DB-9-to-DB-25 or DB-25-to-DB-9 adapters may be needed for
your particular setup.
1.4.5 – General-Purpose Digital Inputs and Outputs (JOPTO Port)
PMAC's JOPTO connector (J5 on PMAC-PC, -Lite, and -VME) 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. Delta Tau's
Accessory 21F is a six-foot cable for this purpose. The PMAC-STD has a different form of this connector from the other
versions of PMAC. Its JOPT connector (J4 on the base board) has 24 I/O, individually selectable in software as inputs or
outputs.
1.4.6 – Machine Connectors
The primary machine interface connector is JMACH1 (J8 on PMAC-PC, J11 on PMAC-Lite, P2 on PMAC-VME, J4 on
PMAC-STD top board). It 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. The next machine interface connector is JMACH2
(J7 on PMAC-PC, P2A on PMAC-VME, J4 on the middle board of an 8-channel PMAC-STD, not available on a PMAC-
Lite). It is essentially identical to the JMACH1 connector for one to four more axes. It is only present if the PMAC card
has been fully populated to handle eight axes (Option 1), because it interfaces the optional extra components.
1.4.7 – LED Indicators
PMACs with the Option CPU have 3 LED indicators: red, yellow, and green. The red and green LEDs have the same
meaning as with the standard CPU: 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 new 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.