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8
Using PMAC2 with
MACRO Interface
Introduction
The PMAC2 controller supports the MACRO ring interface to drives and
motors. MACRO (Motion and Control Ring Optical) is a fiber-optic or copper
ring network between controllers such as PMAC2, and drives and I/O modules.
Its key features are a very high data rate of 125 Mbits/sec, and a very simple
protocol that makes its use almost transparent to the control software. It can
greatly simplify the wiring of a motion control or I/O system, particularly if the
electronic components are distributed about a large machine.
PMAC2 can support two different protocols in a packet of MACRO
information: the Type 0 protocol, and the Type 1 protocol. The Type 0 protocol
is typically used by single-node MACRO slave stations such as the Performance
Controls FLX Drive. The Type 1 protocol is usually used by multiple-node
MACRO slave stations such as the Delta Tau Compact MACRO Station. A
single PMAC2 can simultaneously communicate with slave stations using both
protocols. In the following sections, note carefully which protocol is referenced.
Hardware Setup
The PMAC2 Ultralite boards have the full MACRO interface on board. Other
PMAC2 boards have the MACRO ASIC on board, but require the ACC-42P2
board for the actual interface circuitry. Each PMAC2 with MACRO interface
has a single ring output and a single ring input. The output on any station in the
ring is connected to the ring input of the next station on the ring.
The connections between stations on the MACRO ring can be made with either
fiber optical cable with SC connectors, or with twisted-pair electrical cables with
RJ-45 connectors. PMAC2 Ultralite boards and ACC-42P2 boards can be
purchased with either type of interface, or with both types, which makes it
possible to have an input of one type, and an output of the other type.
PMAC2 User’s Manual – 15 March 1997
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