Instruction Manual

101Publication 1753-UM001C-EN-P - March 2010 101

Chapter

Pulse Testing

Introduction

Pulse testing is a high-frequency diagnostic test that can detect wiring

faults on input devices before demand is placed on the safety system.

There are two ways to generate a pulse test in the GuardPLC family of

products.

• By using Redundant Pulse Test Output (RPTO) and Single Pulse

Test Output (SPTO) certified function blocks in the application

program

• By using the services built into the GuardPLC 1600 and

GuardPLC 2000 controllers’ operating systems

This table lists the pulse test methods available for your product.

Pulse testing cannot be configured on the GuardPLC 1200 and

GuardPLC 1800 controllers, or on the 1753-OB16 output-only module.

The GuardPLC 1800 controller is excluded because it features digital

inputs that are actually analog inputs with 1-bit resolution.

You can choose between the two methods for pulse testing the

GuardPLC 1600 controller and distributed I/O modules (catalog

numbers 1753-IB16, 1753-IB8XOB8, 1753-IB16XOB8, and

1753-IB20XOB8) controlled by the GuardPLC 1600 controller. You

also have the choice of methods for the GuardPLC 2000 controller and

1755-IB24XOB16 module.

Topic Page

Response to OS Configurable Faults 102

Wire for OS Configurable Line Control 103

Input Configuration for Pulse Testing 105

Controller RPTO/SPTO Function Blocks OS Configurable

GuardPLC 1200 yes no

GuardPLC 1600 yes yes

GuardPLC 1800 yes no

GuardPLC 2000 yes yes