Spectrum-controls 1746sc-NI8u Manual do Utilizador descarregar pdf (Página 68)

56 SLC 500

™

Universal Analog Input Module

Interfacing to the PID

Instruction

The universal module was designed to interface directly to the SLC

5/02™ or later processor PID instruction without the need for an

immediate scale operation.

Example - Use NI8u channel data as the process variable in the PID

instruction.

1. Select scaled-for-PID as the data type in the channel configuration

word.

2. Specify the input channel data word as the process variable for the

PID instruction.

In this example, the value -32,617 is the numeric equivalent of

configuration word N10:0 for channel 0. It is configured for a type K

thermocouple, scaled-for-PID, zero the signal for an open circuit, 10

Hz, °C, channel enabled, to return the data word.

Figure 5.8 Programming for PID Control Example

MOV

MOVE

Source N10:0

-32,617

Dest O:3.0

First Pass Bit Initialize NI8u

Channel 0

s:1

] [

PID

Control Block N11:0

Process Variable I:3.0

Control Variable N11:23

Control Block Length 23

SCL

SCALE

Source N11:23

Rate [/10000]

Offset

Dest

Rung 2:0

Rung 2:1

Rung 2:2

Rung 2:3

END

Program Listing

The Rate and Offset parameters should be set per

your application. The Dest will typically be an

analog output channel. Refer to the APS User Manual

or Analog I/O Modules User Manual for specific

examples of the SLC instruction.

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