MiCOM P632
Symbols
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Graphic symbols for block diagrams

Binary elements in compliance with DIN 40900 part 12, September 1992, IEC 617-12: modified 1991

Analog information processing in compliance with DIN 40900 part 13, January 1981. To document the linking of analog and binary signals, additional symbols have been used, taken from several DIN documents.

As a rule, direction of the signal flow is from left to right and from top to bottom. Other flow directions are marked by an arrow. Input signals are listed on the left side of the signal flow, output signals on the right side.

Symbol

Description

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To obtain more space for representing a group of related elements, contours of the elements may be joined or cascaded if the following rules are met:

There is no functional linkage between elements whose common contour line is oriented in the signal flow direction.

Note:

This rule does not necessarily apply to configurations with two or more signal flow directions, such as for symbols with a control block and an output block.

There exists at least one logical link between elements whose common contour line runs perpendicularly to the signal flow direction.

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Components of a symbol

A symbol consists of a contour or contour combination and one or more qualifiers.

Description of the example symbol in the left column
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Blue line: Contur

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Dark red lines: Inputs

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Green lines: Outputs

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Green hash characters: Preferred location for the general function qualifying symbol

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Dark blue asterisk characters: Alternative location for the general function qualifying symbol

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Control block

A control block contains an input function common to several symbols. It is used for the collective setting of several trigger elements, for example.

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Output block

An output block contains an output function common to several symbols.

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Settable control block

The 6 digits in square brackets represent the address under which the function shown in the text is implemented.

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Settable control block with function blocks

The digits in the function block show the settings that are possible for this function.

The text below the symbol assigns the corresponding unit or meaning to each setting.

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Static input

Only the state of the binary input variable is effective.

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Dynamic input

Only the transition from value 0 to value 1 is effective.

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Negation of an output

The value up to the border line is negated at the output.

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Negation of an input

The input value is negated before the border line.

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Dynamic input with negation

Only the transition from value 1 to value 0 is effective.

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AND element

The output variable will be 1 only if all input variables are 1.

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OR element

The output variable will be 1 only if at least one input variable is 1.

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Threshold element

The output variable will be 1 only if at least two input variables are 1. The number in the symbol may be replaced by any other number.

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(m out of n) element

The output variable will be 1 only if just one input variable is 1.

The number in the symbol may be replaced by any other number if the number of inputs is increased or decreased accordingly.

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Delay element

The transition from value 0 to 1 at the output occurs after a time delay of t1 relative to the corresponding transition at the input.

The transition from value 1 to 0 at the output occurs after a time delay of t2 relative to the corresponding transition at the input.

t1 and t2 may be replaced by the actual delay values (in seconds or strobe ticks).

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Monostable flip-flop

The output variable will be 1 only if the input variable changes to 1. The output variable will remain 1 for 100 ms, regardless of the duration of the input value 1 (non-retriggerable).

Without a 1 in the function block, the monostable flip-flop is retriggerable.

The time is 100 ms in this example, but it may be changed to any other duration.

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Analog-digital converter

An analog input signal is converted to a binary signal.

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Subtractor

The output variable is the difference between the two input variables.

A summing element is obtained by changing the minus sign to a plus sign at the symbol input.

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Schmitt Trigger with binary output signal

The binary output variable will be 1 if the input signal exceeds a specific threshold. The output variable remains 1 until the input signal drops below the threshold again.

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Memory, general

Storage of a binary or analog signal.

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Non-stable flip-flop

When the input variable changes to 1, a pulse sequence is generated at the output.

The ! to the left of the G indicates that the pulse sequence starts with the input variable transition (synchronized start).

If there is a ! to the right of the G, the pulse sequence ends with the ending of the 1 signal at the input (synchronized stop).

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Amplifier

The output variable is 1 only if the input variable is also 1.

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Band pass filter

The output only transmits the 50 Hz component of the input signals. All other frequencies (above and below 50 Hz) are attenuated.

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Counter

At the + input the input variable transitions from 0 to 1 are counted and stored in the function block.

At the R(eset) input a transition of the input variable from 0 to 1 resets the counter to 0.

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Electromechanical drive in general, here a relay, for example.

 

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Signal level converter

with electrical isolation between input and output.

L+ = pos. voltage input

L− = neg. voltage input

U1 = device identifier

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Input transformer with phase and item identifiers (according to DIN EN 60445)

Phase identifiers for current inputs:
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for A: A1 and A2

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for B: B1 and B2

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for C: C1 and C2

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for N: N1 and N2

Phase identifiers for voltage inputs
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via transformer 1:

–

for A: 1U

–

for B: 1V

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for C: 1W

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for N: 1N

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via transformer 2:

–

for A: 2U

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for B: 2V

Item identifiers
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for current transformers:

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for A: T1

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for B: T2

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for C: T3

–

for N: T4

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for voltage transformer 1:

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for A: T5

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for B: T6

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for C: T7

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for N: T8

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for VG-N transformer: T90

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for voltage transformer 2:

–

for A: T15

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Change-over contact

with item identifier

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Special symbol

Output relay in normally-energized arrangement (“closed-circuit operation”).

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PC interface

with pin connections

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Multiplier

The output variable is the result of the multiplication of the two input variables.

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Divider

The output variable is the result of the division of the two input variables.

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Comparator

The output variable becomes 1 only if the input variable(s) are equal to the function in the function block.

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Formula block

The output variable becomes 1 only if the input variable(s) satisfy the equation in the function block