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5 - ladder programming examples, Device configuration, Chapter 5 – Rockwell Automation 1746-NR8 SLC 500 RTD/Resistance Input Module User Manual User Manual

Page 73: Ladder programming examples, Device configuration -1, Chapter

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1

Publication 1746-UM003A-EN-P

Chapter

5

Ladder Programming 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

dynamic programming of the configuration word

verifying channel configuration changes

interfacing the RTD module to a PID instruction

using proportional counts scaling (example)

monitoring channel status bits

invoking autocalibration

Device Configuration

The following illustration is used for clarification of the ensuing ladder logic
examples and is not intended to represent an RTD application.

IMPORTANT

Chapter 7 shows a typical application for the RTD module.

1

2

3

0

F8

˚C

°

F

Push-button Switch I:1/1

Pilot Light O:2/0

Pilot Light O:2/1

SLC Processor

1746-IB8 DC Input Module (Sinking)

1746-OB8 DC Output Module (Sourcing)

1746-NR8 RTD Module

Slot #

RTD 0

RTD 1

RTD 2

RTD 3

Pilot Light O:2/3

Pilot Light O:2/2

Selector Switch I:1/0

Display Panel

Ch 0 Alarm Ch 1 Alarm Ch 2 Alarm Ch 3 Alarm

Autocalibration