User's Manual

PMAC VME Hardware Reference Manual
PMAC Basic Specifications 43
Accessory 25: Extended Servo Algorithm Tuning Software
PMAC’s Acc-25 is software for the IBM PC to be used with PMAC OPT-6, the Extended Servo
Algorithm. This software allows the user to setup and tune a PMAC that has the Extended Servo
Algorithm. Comes on one 3.5" diskette and is purchased as a Site License.
OPT-1: Executable code upgrade and site license
Accessory 26A: Serial Communications Converter
PMAC’s Acc-26A is a small circuit board that converts the RS-232 serial communications of the host
computer to the RS-422 serial communications format that PMAC uses. This conversion is performed
through an optically isolated link, enhancing the noise immunity of the communications and separating
the GND of PMAC from that of the host. A cable is provided for easy connection to PMAC. Standard
serial connectors, DB-9 or DB-25, can be used to connect the Acc-26 to the host computer.
Most host computers with RS-232 can do reasonable communications directly with PMAC’s RS-422
port, straight over the Acc-3D cable. PMAC’s receivers take RS-232 signals robustly; most host RS-232
receivers take RS-422 signals, but with limited noise margin. Some cannot accept RS-422 at all. Acc-26
is for those users who cannot communicate without it, or for those who want to increase their noise
margins. Anyone using the PMAC serial port in an actual industrial environment should either use an
RS-422 port in their host computer, or use a level converter such as the Acc-26.
OPT-1: Host RS-232 to PMAC RS422. For PMAC PC, VME, STD, and Lite with Option 9.
IDC 26-pin 60 cm (24") serial cable provided for PMAC PC, VME, and Lite. No cable
provided for PMAC STD.
OPT-2: Host RS-232 to PMAC RS232. For PMAC STD and Lite. IDC 10-pin 60 cm (24") serial
cable provided for PMAC Lite. No cable provided for PMAC STD.
OPT-3: Host RS-232 to PMAC RS422. For PMAC VME to GE 90/70. User specifies 10 or 15-
pin 60 cm (24") serial cable provided.
Accessory 27: Optically Isolated I/O Board
PMAC’s Acc-27 is a small circuit board that provides eight optically isolated inputs and eight optically
isolated outputs. The I/O is rated to 24V and 100 mA. The board is designed for easy connection
through a provided flat cable to PMAC's JTHW port (J3). This I/O is intended for general-purpose
programmatic use on PMAC. When Acc-27 is used, no other JTHW port accessories may be used (Acc-
8D Opt 7, Acc-8D Opt 9, Acc-18, Acc-34).
OPT-2A: DB-25 input connection
OPT-2B: 18-pin input terminal block (default)
Accessory 28: A/D Conversion Board
PMAC’s Acc-28 Analog-to-Digital Conversion board has four channels of high-speed (60 usec), high-
resolution analog input in the +/-10V range. It is a small, DIN-rail-mountable board that connects to
PMAC with a provided flat cable. These inputs can be used for servo position feedback, as from an
LVDT or potentiometer, or for general-purpose use (e.g., to monitor process variables such as pressure or
tension, to allow analog speed control, or to monitor motor currents). The analog inputs are optically
isolated from the PMAC’s digital circuits.
For each Acc-28 in the system, there must be one DSP-GATE IC on PMAC or its Acc-24 to process the
converted digital signal from the A/D.
OPT-2A: DB-15 input connection
OPT-2B: 12-pin input terminal block (default)