Network; Introduction; Ieee 1394B Multi-Node Configuration Ny4110 Mcu - Bosch rexroth NYCe 4000 Hardware Manual

NYCe 4000 Multi-axis motion control system Hardware Sys‐
tem Manual
14

Network

14.1

Introduction

14.2

IEEE 1394b multi-node configuration NY4110 MCU

The MCU in a node uses a cable to connect to the PC and optionally other
nodes. The type of cable connection depends on the MCU model.
● The NY4110 MCU uses IEEE 1394b network cables.
● The NY4112 and NY4114 MCU use IEEE 802.3 network cables.
The IEEE 1394b network can be described as a communication channel with
multiple masters (if more than one node is connected to the network). The
network is a standard IEEE 1394b network and realizes the communication
between the host and one or more nodes as well as between the nodes
(without host intervention).
The IEEE 802.3 ethernet network is a serial bus network, as any other
standard ethernet network.
In order to make this multi-master network operate independently from the
host PC and guarantee synchronization and performance between the
nodes, you must start the IEEE 1394b network tree at the host PC and
connect the nodes using a "binary tree" topology, see
IEEE 1394b network, PC as single connection point" on page
IEEE 1394b connection is connected to the host PC. This assures that the
MCU modules in the nodes only operate as a repeater in the IEEE 1394b
network, if applicable. "Node 1", "Node 2", "Node3", "Node5", and "Node7"
operate as repeaters on the IEEE 1394b network.
The maximum number of devices connected to the IEEE 1394b network is
limited to 63. This count includes the PC, so you can have a maximum of 62
nodes connected in the network. It is strongly discouraged to lay out the
IEEE 1394b network as a daisy-chain (from one node to the following node to
the following node etc). The "binary tree" topology minimizes the "depth" of
the IEEE 1394b network and thus reduces latency times. The depth of the
tree must be less than or equal to 16 hops, but additionally, the hop count
from the "deepest" MCU in the left branch of the tree to the "deepest" MCU in
the right branch of the tree must also be less than or equal to 16. Any device
in the network introduces at least one hop.
For an LMS, due to the physical layout, a daisy-chain of MCUs is often the
practical solution. The limitation of 16 hops also applies in this setup.
fig. 14-1 "NYCe 4000
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Network