PMAC Quick Reference Guide
28 Installing and Configuring PMAC
In addition, the amplifier enable signal can be controlled manually by setting Ix00=0 and using the
properly defined Mx14 variable.
Amplifier Fault Signal (FAULTn)
This input can take a signal from the amplifier so PMAC knows when the amplifier is having problems,
and can shut down action. The polarity is programmable with I-Variable Ix25 (I125 for motor #1) and the
return signal is analog ground (AGND). FAULT1 is pin 49. With the default setup, this signal must be
actively pulled low for a fault condition. In this setup, if nothing is wired into this input, PMAC will
consider the motor not to be in a fault condition. The amplifier fault signal can be monitored using the
properly defined Mx23 variable.
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. Acc-21F is a six-foot cable for this purpose. Typically, these
inputs and outputs are accessed in software through the use of M-Variables. In the suggested set of M-
Variable definitions, variables M1 through M8 are used to access outputs 1 through 8, respectively, and
M11 through M18 to access inputs 1 through 8, respectively. This port maps into PMAC’s memory space
at Y address $FFC2.
• The Acc-21S is an I/O simulator for the PMAC JOPTO port; it provides eight switch inputs and eight
LED outputs.
• The Acc-21S is a good tool for I/O simulation and troubleshooting of the JOPTO port in PMAC.
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