SynqNet Glossary

Boot Image A node binary image that contains just enough information for the SynqNet controller to identify and communicate with the connected node(s) on a SynqNet network. Boot image should be preloaded on node. See run-time image.
Cat 5 Category 5, specification for twisted cables (5e is enhanced).
Control latency The network latency plus internal delays within a node.
Controller The Motion controller and SynqNet network host, there should only be one controller per network.
CRC Cyclic Redundancy Check. See CRC Error Counter.
Data Class All SynqNet data falls into one of two classes: cyclic or service
Data Type On each node, cyclic data is mapped to logic modules based on dataType.
Downstream From the controller to a node. Usually refers to the direction of the data flow.
DP Drive Processor
Drive Processor Digital signal processor or other processor responsible for controlling the motor currents.
Drive_Mode Specifies the operational mode of the drive e.g. torque / braking etc.
Dual String A topology which consists of two String networks connected to one controller. This topology is currently unsupported.
Earth Ground
EFT Electrical Fast Transients
ESD End of Stream Delimiter (IEEE802.3)
Farthest node The node that is located the furthest down on the network from the controller. It is also the node that is connected to the redundant link in a Ring topology.
Fault A 'fault' prevents a drive from working.
FDDI Fiber Distributed Data Interface
Ground Earth
Little-endian Memory organizations where, within a given 16- or 32-bit word, bytes at lower addresses have lower significance (the word is stored "little-end-first").
MAC Medium Access Controller (see SynqNet MAC)
Message The unit of communication inbetween the SQNL and the Drive Processor.
MII Media Independent Interface (IEEE802.3: connects PHY to MAC devices)
Motion Block A set of hardware functions relating to motion control such as an encoder counter, capture, and compare functions, pulse generators and so forth.
Network latency The sum of the time taken to (1) send the feedback data to the controller over SynqNet, (2) manipulate the data at the controller, (3) and send the demand data to the node over SynqNet.
Network Phase The mode of operation of SynqNet, determined by the controller.
Node Means 'slave node' and not the controller, unless otherwise stated.
Node State Internal SynqNet state of one given node in the network. Determines the basic behavior allowed for the node.
Packet The unit of communication in SynqNetT
PDO A CAN message that contains operational data.
PHY Physical Layer Interface: a device that translates 100BT signals into 4 bit MII interface data.
PLL Phase Locked Loop
Port energized The receive PHY in a port is in receipt of valid symbols.
PRBS Pseudo Random Binary Sequence
PSU Power Supply Unit
Quadlet A 32-bit word (from IEEE 1394)
Receive port The port selected at a node to receive the command packets, whichis is normally the IN port.
Redundant link In a Ring topology only: a point-to-point link that is not used to carry normal operational traffic, it is usually the link connected to the controller's IN port.
Remote Motion Block A SynqNet node that can be connected to a drive that has a +/-10V or pulse control interface.
Ring The standard SynqNet topology
Ring of Rings A topology which consists of two Ring networks connected to one controller. This topology is currently unsupported.
RMB Remote Motion Block
Run-time Image A node binary image contains the logic for full operation of the node on a SynqNet network. The run-time image needs to be manually downloaded. See boot image.
Screen Shield
Shield Screen
SMI Serial management interface (part of the MII)


Switch Mode Power Supply
SQNL SynqNet Node Logic.
SSD Start of Stream Delimiter (IEEE802.3)
STP Shielded Twisted Pair
String An alternative to the Ring topology without the redundant link.
Synq_Cycle One SynqNet cycle consists of one downstream cycle and one upstream cycle, in which packets are sent/received across the network by the controller and the connected node(s).
SYNQ packet The SynqNetT packet that is used as a network timing reference.
Synq_Rate The rate of cyclic communication over SynqNetT.
SynqNet MEI's motion control network that is specifically designed for high-speed cyclic messaging in high performance motion control applications.
SynqNet MAC Medium Access Controller: Standard data link layer logic function in all nodes. Translates MII signals from PHY into internal module bus.
SynqNet Node Logic A digital logic circuit (located in a node) that implements both SynqNet MAC and Motion Block functions. May be supplied either as an FPGA or as an ASIC.
SynqNetT A 100Mbit, full-duplex motion control network devised by MEI.
Tree A topology which consists of a combination of Ring and String networks connected to one controller. This topology is currently unsupported.
Upstream From the node to the controller . Usually refers to the direction of the data flow.
UTP Unshielded Twisted Pair
Warning A 'warning' is an indication that a drive, though operational, is likely to exhibit a fault soon.


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