User's Manual

Turbo PMAC PCI HRM
36 Machine Connections
For the V/F converter to work, PMAC must have +/-12V supply referenced to digital ground. If PMAC is in
a bus configuration, this usually comes through the bus connector from the bus power supply. In a
standalone configuration, this supply must still be brought through the bus connector (or the supply terminal
block), or it must be jumpered over from the analog side with E85, E87, and E88, defeating the optical
isolation on the board.
Thumbwheel Multiplexer Port (JTHW Port)
The Thumbwheel Multiplexer Port, or Multiplexer Port, on the JTHW (J3) connector has eight input lines
and eight output lines. The output lines can be used to multiplex large numbers of inputs and outputs on the
port, and Delta Tau provides accessory boards and software structures (special M-variable definitions) to
capitalize on this feature. Up to 32 of the multiplexed I/O boards may be daisy-chained on the port, in any
combination.
The ACC-18 Thumbwheel Multiplexer board provides up to 16 BCD thumbwheel digits or 64 discrete TTL
inputs per board. The TWD and TWB forms of M-variables are used for this board. The Acc-34x family
Serial I/O Multiplexer boards provides 64 I/O points per board, optically isolated from PMAC. The TWS
form of M-variables is used for these boards. The Acc-8D Option 7 Resolver-to-Digital Converter board
provides up to 4 resolver channels whose absolute positions can be read through the thumbwheel port. The
TWR form of M-variables is used for this board. The Acc-8D Option 9 Yaskawa
TM
Absolute Encoder
Interface board can connect to up to 4 of these encoders. The absolute position is read serially through the
multiplexer port on power up.
If none of these accessory boards is used, the inputs and outputs on this port may be used as discrete, non-
multiplexed I/O. They map into PMAC’s processor space at Y address $78801. The suggested M-variable
definitions for this use are M40 to M47 for the 8 outputs, and M50 to M57 for the eight inputs. The Acc-27
Optically Isolated I/O board buffers the I/O in this non-multiplexed form, with each point rated to 24V and
100 mA.
Optional Analog Inputs (JANA Port)
The JANA port is present only if Option 12 is ordered for the PMAC PCI. Option 12 provides eight 12-bit
analog inputs (ANAI00-ANAI07). Option 12A provides eight additional 12-bit analog inputs (ANA08-
ANAI15) for a total of 16 inputs. The analog inputs can be used as unipolar inputs in the 0V to +5V range,
or bi-polar inputs in the -2.5V to +2.5V range.
The analog-to-digital converters on PMAC require +5V and -12V supplies. These supplies are not isolated
from digital +5V circuitry on PMAC. If the PMAC is plugged into the PCI bus, these supplies are taken
from the bus power supply. In a standalone application, these supplies must be brought in on terminal block
TB1. The -12V and matching +12V supply voltages are available on the J30 connector to supply the analog
circuitry providing the signals.