Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manuel d'utilisateur télécharger pdf (Page 56)

Chapter 6

Publication

17466.8 - April 1997

Ladder Logic Configuration

Examples

Earlier chapters explained how the configuration word defines the

way a channel operates. This chapter shows the programming

required to enter the configuration word into the processor memory.

It also provides you with segments of ladder logic specific to unique

situations that might apply to your programming requirements. The

example segments include:

• initial programming of the configuration word

• interfacing the analog module to a PID instruction

• monitoring channel status bits (Class 3 Mode only)

To enter data into the channel configuration word (O:e.0 through

O:e.7) when the channel is disabled (bit 11 = 0), follow these steps.

Refer to page 5–2 for specific configuration details.

Example - A 1746-NI8 analog module is residing in slot 3 of a 1746

chassis. Configure all eight channels with the same parameters.

• Input Type:

4-20 mA

• Data Format:

scaledforPID

• Open Circuit:

zero if open circuit

• Filter Frequency:

10 Hz

• Channel Enable:

enabled

• Not Used

Bit Setting

1112131415

0000

910 8 67450123

Bit Number

1100 00110100

This example transfers configuration data and sets the channel enable

bits of all eight channels with a single File Copy instruction.

Initial Programming

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Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manuel d'utilisateur Page 56