According to the CEI standard, %I indicates a language object of type discrete IN.

According to the CEI standard, %IW indicates a language object of type analog IN.

According to the CEI standard, %KW indicates a language object of type constant word.

According to the CEI standard, %M indicates a language object of type memory bit.

According to the CEI standard, %MW indicates a language object of type memory word.

According to the CEI standard, %Q indicates a language object of type discrete OUT.

According to the CEI standard, %QW indicates a language object of type analog OUT.

On a network, the identification of a station. In a frame, a grouping of bits that identifies the frame's source or destination.

AC variable speed drive.

An ARRAY is a table containing elements of a single type.The syntax is as follows: ARRAY [<limits>] OF <Type>Example:ARRAY [1..2] OF BOOL is a one-dimensional table with two elements of type BOOL.ARRAY [1..10, 1..20] OF INT is a two-dimensional table with 10x20 elements of type INT.

ASCII is the abbreviation of American Standard Code for Information Interchange.This is an American code (but which has become an international standard) that uses 7 bits to define every alphanumerical character used in English, punctuation symbols, certain graphic characters and other miscellaneous commands.

BOOL is the abbreviation for the Boolean type. This is the basic data type in computing. A BOOL variable can have either of the following two values: 0 (FALSE) or 1 (TRUE). A bit extracted from a word is of type BOOL, for example: %MW10.4.

Broadcast communications send packets from one station to every network destinations. Broadcast messages pertain to every network devices or only one device for which the address is not known.

When 8 bits are grouped together, they are called a BYTE. You can enter a BYTE either in binary mode or in base 8. The BYTE type is encoded in an 8 bit format which, in hexadecimal format, ranges from 16#00 to 16#FF.

The configuration gathers the data which characterizes the machine (invariant) and which is necessary for the module to operate. All this information is stored in the constant PLC %KW zone. The PLC application cannot modify them.

Schneider Automation PLC programming software.

CPU is the abbreviation of Central Processing Unit: generic name used for Schneider Electric processors.

CRC is the abbreviation of Cyclic Redundancy Checksum: it indicates whether no character has been "deformed" during frame transmission.

DFB is the abbreviation of Derived Function Block. DFB types are function blocks that can be defined by the user in ST (Structured Text), IL (Instruction List), LD (Ladder Diagram) or FBD (Function Block Diagram) language. Using these DFB types in an application makes it possible to:

DINT is the abbreviation of Double INTeger (encoded in 32 bits). The upper/lower limits are as follows: -(2 to the power of 31) to (2 to the power of 31) - 1.Example:-2147483648, 2147483647, 16#FFFFFFFF.

Module with discrete inputs/outputs.

EBOOL is the abbreviation of Extended BOOLean. An EBOOL type has a value (0 (FALSE) or 1 (TRUE), but also rising or falling edges and forcing functions. An EBOOL variable occupies one byte in memory. The byte contains the following information:

The default value of each bit is 0 (FALSE).

EF is the abbreviation of Elementary Function. This is a block used in a program which performs a predefined logical function. A function does not have any information on the internal state. Several calls to the same function using the same input parameters always return the same output values. You will find information on the graphic form of the function call in the "[functional block (instance)]". Unlike a call to a function block, function calls include only an output which is not named and whose name is identical to that of the function. In FBD, each call is indicated by a unique [number] via the graphic block. This number is managed automatically and cannot be modified. You position and configure these functions in your program in order to execute your application. You can also develop other functions using the SDKC development kit.

FBD is the abbreviation of Function Block Diagram. FBD is a graphical programming language that works like a flowchart. By adding simple logical blocks (AND, OR, etc.), each function or function block in the program is represented in this graphical format. For each block, the inputs are on the left and the outputs on the right. Block outputs can be linked to inputs of other blocks in order to create complex expressions.

Field bus used to connect sensor or actuator type devices.

FLASH memory is nonvolatile memory that can be overwritten. It is stored on a special EEPROM that can be erased and reprogrammed.

A frame is a group of bits that form a discrete block of information. Frames contain network control information or data. The size and composition of a frame is determined by the network technology being used.

A method of data transmission capable of transmitting and receiving over the same channel simultaneously.

A method of data transmission capable of communication in either of two directions, but in only one direction at a time.

A hub device connects a series of flexible and centralized modules to create a network.

INT is the abbreviation of single INTeger (encoded in 16 bits). The upper/lower limits are as follows: -(2 to the power of 15) to (2 to the power of 15) - 1. Example:-32768, 32767, 2#1111110001001001, 16#9FA4.

IODDT is the abbreviation of Input/Output Derived Data Type. The term IODDT indicates a structured data type representing a module or a channel of a PLC module. Each expert module has its own IODDTs.

LED is the abbreviation of Light emitting diode. An indicator that lights up when electricity passes through it. It indicates the operation status of a communication module.

LRC is the abbreviation of Longitudinal redundancy check: it has been devised to address the low probability of error detection of parity checking.

Main program task. It is obligatory and is used to carry out sequential processing of the PLC.

I/O modules using several open standard communication networks.

There are two meanings of the word "network".

PLC is the abbreviation of Programmable logic controller. The PLC is the brain of an industrial manufacturing process. It automates a process as opposed to relay control systems. PLCs are computers suited to survive the harsh conditions of the industrial environment.

Describes message formats and a set of rules used by two or more devices to communicate using those formats.

Serial communication standard which defines the voltage of the following service:

There is, however, in the case of any attenuation of the signal, detection provided up to the limits -3 V and +3 V. Between these two limits, the signal will be considered as invalid.RS232 connections are quite sensitive to interferance. The standard specifies not to exceed a distance of 15 m or a maximum of 9600 bauds (bits/s).

Serial connection standard that operates in 10 V/+5 V differential. It uses two wires for send/receive. Their "3 states" outputs enable them to switch to listen mode when the transmission is terminated.

RTU is the abbreviation of Remote Terminal Unit. In RTU mode, data is sent as two four-bit, hexadecimal characters, providing for higher throughput than in ASCII mode for the same baudrate. Modbus RTU is a binary protocol and more time delay critical than the ASCII protocol.

Program module belonging to a task which can be written in the language chosen by the programmer (FBD, LD, ST, IL, or SFC). A task can be composed of several sections, the order of execution of the sections corresponding to the order in which they are created. This order is modifiable.

Digital protection relay for protection, control and monitoring of power systems.

The association of a port with an IP address, serving as an identification of sender or recipient.

ST is the abbreviation of Structured Text.The structured literal language is a developed language similar to computer programming languages. It can be used to organize a series of instructions.

A STRING variable is a series of ASCII characters. The maximum length of a string is 65,534 characters.

TAP is the abbreviation of Transmission Access Point: the bus connection unit.

A group of sections and subroutines, executed cyclically or periodically for the MAST task, or periodically for the FAST task. A task possesses a level of priority and is linked to inputs and outputs of the PLC. These I/O are refreshed in consequence.

Memory entity of type BOOL, WORD, DWORD, etc., whose contents can be modified by the program currently running.

The type WORD is encoded in a 16 bit format and is used to perform processing on series of bits.

Graphical operator terminal.

Safety module used for processing of safety signals to monitor both the component and the wiring of a safety system, including devices for general monitoring as well as application specific models.