PMAC Quick Reference Guide 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. 28 Installing and Configuring PMAC