User's Manual

PMAC2A PC104 Hardware Reference Manual

Machine Connections

Amplifier Fault Signal (FAULT-)

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 ground (GND). FAULT1- is pin 35. With the default setup, this

signal must actively be 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.

Optional Analog Inputs

The optional analog-to-digital converter inputs are ordered either through Option-12 on the CPU or

Option-2 on the axes expansion board. Each option provides two 12-bit analog inputs analog inputs

with a ±10Vdc range.

Compare Equal Outputs

The compare-equals (EQU) outputs have a dedicated use of providing a signal edge when an encoder

position reaches a pre-loaded value. This is very useful for scanning and measurement applications.

Instructions for use of these outputs are covered in detail in the PMAC2 User Manual.

Serial Port (JRS232 Port)

For serial communications, use a serial cable to connect your PC's COM port to the J8 serial port

connector present on the PMAC2A PC/104 CPU. Delta Tau provides the Acc-3L cable for this

purpose that connects the PMAC to a DB-9 connector. Standard DB-9-to-DB-25 or DB-25-to-DB-9

adapters may be needed for your particular setup.