ABB PLUTO Safety-PLC User Manual

30 2TLC172001M0211_A
6.2 Single channel systems
Instead of using two-channel systems some applications can be made failsafe by using the
principle of a dynamic single channel. By supplying electronic devices with dynamic signals a fault
in the electronics will lead to a static on or off state at the input which will be detected immediately.
By inverting the signal in or at the sensor, short circuits over the sensor are also detected.
Note: Serial connection is legal, but a short circuit of an even number of sensors is not
detected.
A direct connection between two terminals of IQ type is always detected. Detection of a short
circuit between an output of IQ and an input of I is not detected.
See 13.1 for maximum number of sensors that can be connected in series.
6.3 Emergency stop
When emergency stop functions remain inactivated for long periods of time, the function will
not be monitored. It is therefore strongly recommended that emergency stop systems are
periodically, manually tested and that this forms part of the maintenance instructions for the
machine.
Dyn. C
Dyn. A Dyn. B
IQ_IQ_
IQ_
I_
IQ_
+ -
IQ_
I_
IQ_
I_
+ - Adam Eva

ABB PLUTO Safety-PLC Specifications

General

Brand	ABB
Model	PLUTO Safety-PLC
Category	Controller
Language	English

Summary

General Pluto Safety System Overview

Pluto Electrical Installation Guidelines

Pluto Inputs and Outputs

Digital Failsafe Inputs

Explains how digital failsafe inputs are connected and function.

IQ Terminals: Failsafe Inputs and Non-Failsafe Outputs

Details IQ terminals for failsafe inputs or non-failsafe outputs.

Pluto Analogue Inputs

Covers 0-10V/4-20mA analogue inputs and their safety configurations.

Pluto Failsafe Outputs

Discusses relay and solid-state failsafe output types and their operation.

Pluto Input Connection Guide

Connecting Pluto Safety Devices

Dual Channel Safety Systems

Single Channel Safety Systems

Emergency Stop Functionality

Recommendations for testing and maintaining emergency stop functions.

External Short Circuit Monitoring

Safety Devices with Transistor Outputs

Safety Mats and Safety Edges

Two-Hand Control Implementation

Pluto Output Connection Examples

Output Connection Examples

Pluto Bus Communication

Pluto Programming and Software

Pluto Technical Data and Specifications

Pluto Safety Parameters

Details safety parameters like SIL, PL, and failure rates for Pluto components.

Pluto Message and Fault Code Appendix