8. Glossary
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Alternative name for each of the two controllers (PLCB and PLCA) that form a cluster.
Indicates that the devices can perform transmitting communications / receiving data, but only in one
direction at a time, or can transmit or receive data.
High Speed Deterministic Network. Deterministic network, often redundant, used for exchanging
interlocking messages between interlocking PLCs.
Procedure for replacement of system modules without the need for de-energizing the same. Usually used
in exchanges of I/O modules.
Stands for International Electrotechnical Commission, or International Electrotechnical Commission is an
international standardization body that prepares and publishes international standards for electrical
scope, electronic and related technologies.
Generic standard for operation and utilization of PLCs. Old IEC 1131.
Third part of the generic standard for operation and use of PLCs, IEC61131.
Device which adapts electrically and/or logically the signal transference between two pieces of
equipment.
High priority attending event which temporarily stops the program execution and detour for a specific
attending routine.
Defines how often a task is performed..
Module belonging to the inputs and outputs subsystem.
Set of analog or digital I/O modules and interfaces of a programmable controller.
Also called I/O. Data I/O devices of a system. In case of PLCs, typically correspond to digital or analog
inputs or outputs modules which monitor or activate the controlled device.
Stands for isolated or isolating.
Memory quantity unit. Means 1024 bytes (if 1kbyte).
Acronym for Liquid Crystal Display
Light emitting diode. It’s a type of diode that emits light when electrically stimulated. Used for light
indication.
Graphic matrix where are inserted the language instructions of a relay diagram which compose a
applicative program. A group of logics organized in sequence form a program module.
POU form the program type, created and filled automatically by MasterTool. The user must not change
this POU.
The only task allowed by a redundant PLC. Calls the MainPrg program.
Identifies the Altus program for microcomputers, executable in Windows environment, which allows the
development of applications for the Nexto CPUs series. Throughout the manual, this program is referred
to by the acronym or as MasterTool IEC XE programmer..
Equipment connected to a communication network where the commands requests to the other network
devices originate.
Master-Slave
Communication
Network
Communication network where information transfers are initiated only from a single node (network
master) connected to the data bus. The other network nodes (slaves) respond only when requested.
Set of options available and displayed by a program on video and that can be selected by the user to
activate or perform a certain task.
In PROFIBUS networks, it’s a network with only one master.
Address which the PLC accesses a specific I/O module.
Module (referencing
hardware)
Basic element of a complete system that has well defined functions. Normally the system is connected by
connectors and can be easily replaced.
Module (referencing
software)
Part of an application program capable of performing a specific function. It can be run independently or in
conjunction with other modules, exchanging information via parameter passing.
Simultaneous dissemination of information to a particular group of interconnected nodes in a
communication network.
In PROFIBUS networks, it’s a network with more than one master.
Multimaster
Communication
Network
Communication network where information transfers are initiated by any node connected to the data bus.
Logical names for the Ethernet interfaces present in the NX3010 CPU (NET 1 and NET 2) and modules
NX5000. The CPU NX3010 and the NX5000 modules have only the NET1 interface.
Denomination of one of the two synchronism channels between PLCA and PLCB. The other is called
NETB.
Denomination of one of the two synchronism channels between PLCA and PLCB. The other is called
NETA.
Method used by all nodes in a communication network to synchronize data transmissions and resolve
potential conflicts of simultaneous transmissions.
Strategy to define pairs of redundant ports within a half-cluster, sharing the same Ethernet IP address.
Any station network with an ability to communicate using a protocol established.
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General