User's Manual

PMAC VME Hardware Reference Manual
30 PMAC VME Connector Pinouts
P2A JMACH2 (96-Pin
Header on Option 1A)
Front View
The P2A connector is used to connect PMAC to the first four channels (Channels 1, 2, 3, and 4) of servo amps, flags,
and encoders.
Note 1: In standalone applications, these lines can be used as +5V power supply inputs to power PMAC’s digital
circuitry. However, if a terminal block is available on your version of PMAC, it is preferable to bring the +5V power
in through the terminal block.
Note 2: Referenced to digital common (GND). Maximum of +
12V permitted between this signal and its
complement.
Note 3: Leave this input floating if not used (i.e. digital single-ended encoders). In this case, jumper (E18 - 21, E24 -
27) for channel should hold input at 2.5V.
Note 4: +
10V, 10mA max, referenced to analog common (AGND).
Note 5: Leave floating if not used; do not tie to AGND. In this case, AGND is the return line.
Note 6: Functional polarity controlled by jumper(s) E17. Choice between AENA and DIR use controlled by Ix02 and
Ix25.
Note 7: Functional polarity controlled by variable Ix25. Must be conducting to 0V (usually AGND) to produce a 0 in
PMAC software. Automatic fault function can be disabled with Ix25.
Note 8: Pins marked -LIMn should be connected to switches at the positive end of travel. Pins marked +LIMn should
be connected to switches at the negative end of travel.
Note 9: Must be conducting to 0V (usually AGND) for PMAC to consider itself not into this limit. Automatic limit
function can be disabled with Ix25.
Note 10: Functional polarity for homing or other trigger use of HMFLn controlled by Encoder/Flag Variable 2 (I902,
I907, etc.) HMFLn selected for trigger by Encoder/Flag Variable 3 (I903, I908, etc.). Must be conducting to 0V
(usually AGND) to produce a '0' in PMAC software.