Page Content

1 Library
2 Block
3 Description
- 3.1 Defining Trigger Type
- 3.2 Defining an offset
- 3.3 Resetting the cycle
- 3.4 Limitations
4 Mask
5 Parameters
6 Input
7 Output
8 Characteristics
9 Example
10 Related Items

Library

RT-Events Math Operations

Block

FIG 1: RTE Insert Block

Description

The RTE Insert block inserts N pulses in an RTE Boolean signal. The pulses are inserted between N+1 consecutives pulses of the input signal. The offset parameter determines where the pulses are inserted relative to the beginning of the cycle. The insertion is repeated at every cycle of M pulses.

The pulse width and delay parameters characterize the inserted pulses. These parameters are measured as a percentage of the last input signal period. The delay parameters are relative to the end of the last pulse.

Here is a small example where the parameters N, M, width and delay are respectively 2,4,16% and 16%.

FIG 2: Typical Example of the RTE Insert Block Behaviour

The RTE Insert block enables you to:

Define a trigger type

Define an offset

Reset (or restart) the cycle

Defining Trigger Type

The Insert block counts the pulses each time an edge of the selected type occurs. By selecting a rising trigger, high pulses will be inserted in the input. By selection a falling trigger, low pulses will be inserted in the input.

Defining an offset

The Insert block allows the user to choose where the pulses should be inserted in the input signal. The offset parameter determines an offset in pulses from the beginning of the cycle where the pulse are inserted.

Resetting the cycle

The Insert block determines where the pulses should be inserted relative to the first pulse of a cycle. The external reset signal can reset the internal counter that determine the beggining of a cycle. Each time an specified edge occur on the trigger input signal, the counter is reset to zero. The reset can be performed on rising edge, falling edge, or either.

Limitations

One of the limitations of this block occurs when the frequency of the input signal increases rapidly and the next rising edge of the input signal occurs before the new pulse was inserted. In this case, the input signal and the new pulse are combined with a logical AND.

Example:

In the extreme case where the time of the events of the new pulses exceeds the time of the falling edge of the next input pulse, the events are skipped.

Example:

Mask

Parameters

Trigger type	Determine the kind of edges used to count pulses (raising or falling).
Number of pulses to insert	The number of pulses to insert at each cycle.
Number of pulses by cycle	The number of pulses from the input signal, to complete a cycle.
Offset	Relative offset to the beginning of the cycle where the pulses are inserted.
Pulse width	Pulse width in percent of the input signal period.
Delay	Pulse delay in percent of the input signal period relative to the end of the pulse.
External Reset	Edge type used to reset the cycle (none, rising, falling, either).
Maximum Number of events	The maximum number of events or transitions that can occur during a single step. Over this number, events are skipped.

Input

Input (RTE Boolean)	RTE Boolean signal (pulse waveform) to modify
External Reset (Double)	RTE Boolean signal use to reset a cycle

Output

Output (RTE Boolean)

Modified RTE Boolean signal

Characteristics

Direct Feedthrough	Yes
Sample time	Inherited and fixed discrete.
Work offline	Yes
Dimensionalized	Yes

Example

The rte_encoder.mdl model demonstrates how to use RT-Events blocks to simulate an incremental encoder connected to a rotating object. This example also shows how to use blocks of the library to insert fault, to filter noise and to measure some characterics of RTE Boolean signal. In this example the RTE Insert block is used to insert fault in the generated pulse of the encoder.

https://opal-rt.atlassian.net/wiki/spaces/PRD/pages/143624400