User's Manual

PMAC VME Hardware Reference Manual
46 PMAC Basic Specifications
The Acc-36P’s design features make it an ideal analog data acquisition board for monitoring and
collection of signals from a variety of sensors and transducers. Up to 24 Acc-36Ps may be connected to
PMAC providing up to 384 possible analog input channels.
This accessory’s intended use differs from that of the PMAC's other ADC board (Acc-28A). Acc-28A
has been designed for use in converting signals from analog transducers via the PMAC's DSPGATE gate
array IC (see the PMAC User Manual and the Acc-28A Manual). As a result, one PMAC Gate Array IC
is required for each Acc-28A. In contrast, Acc-36P does not have this requirement and up to 24 Acc-36Ps
may be connected to PMAC providing up to 384 possible analog input channels.
Acc-36P: 16-Channel, 12-bit A/D converter board, mountable in PC bus
Acc-36V: 16-Channel, 12-bit A/D converter board, mountable in VME bus
OPT-2: 20-cm (8") 50-pin 3-connector cable when Acc-36P is used with PMAC OPT-2, Acc-14D,
or Acc-24P
Accessory 39: Handwheel Encoder Converter Board
PMAC’s Acc-39 is a small printed circuit board designed for the purpose of interfacing the PMAC
controller with a handwheel or a slow time base encoder. Acc-39 provides a cost effective solution for
PMAC applications in which the four or the eight standard high speed encoder decode circuits on the
PMAC’s DSPGATES are used already and yet there is an additional need for just one handwheel encoder
input. This accessory accepts one pair of A QUAD B encoder signals. Both single-ended (A and B),
differential line driver encoder inputs (A, A/ and B, B/), and complementary open collector encoder
signals can be accepted. The maximum rate is approximately 31 A/B square waves per servo cycle. With
PMAC’s default servo frequency of 2.26 kHz this translates to a maximum encoder line rate of 62.5 kHz.
The x4 circuitry provides a maximum of 250,000 counts per second at this servo frequency.
Acc-39 interfaces to PMAC through PMAC’s front panel port (JPAN) via the supplied 26-pin flat cable.
When this accessory is installed then the normal PMAC panel functions cannot be used at the same time
(I2 should be set to 1 or 3).
Acc-39: Handwheel encoder converter board, w/60-cm (24") cable to JPAN
OPT-1: Rail mount
Accessory 40: On-Site Field Service and Training
Acc-40: On-site field service/training; 2-day (16 hr) minimum, plus lodging, travel cost and time
Accessory 41: Servo Training Systems
Acc-41A: Servo training system, torsional bar/diskette mechanism, PMAC not included
Acc-41B: Servo training system mass/spring/damper mechanism, PMAC not included
Future Accessories
PMAC is constantly being upgraded with new capabilities, options, and accessories. Contact the factory
for the latest update.