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Pre-installation Guidelines SIMATIC 545/555/575 System Manual

2.3 575 Fault Relay Operation

The 575 CPU provides a normally open (NO) relay output (fault relay) for

use in a low-voltage safety chain. The CPU must successfully complete

power-up diagnostics before its fault relay is closed. If an error is detected

by the software or the hardware, then the fault relay does not close. During

normal operation, the fault relay remains closed. The fault relay opens if a

fatal error is detected by the 575 CPU. See Figure 4-22 for fault relay

pinouts.

Table 2-1 lists the electrical specifications of the fault relay output.

Table 2-1 Fault Relay Output Electrical Specifications

Features Description

Contact-to-contact breakdown voltage 120 VAC

Contact-to-ground breakdown voltage 500 VAC

Voltage rating 30 V, AC or DC

Current rating

500 mA resistive AC or DC

200 mA inductive DC (L/R = 7 ms)

100 mA inductive AC (power factor > 0.4)

The 575 CPU fault relay is under software control. The operating system

software can be in one of three states: Idle, Normal, or Fault. The fault relay

closes only when the software state is Normal. The transitions to and from

the various states are described in this section and are shown in Figure 2-4.

Idle State

Fault relay operation begins in the Idle state and transitions to one of two

states. The fault relay transitions to the Fault state if a fault is detected

during CPU initialization, or if you perform a battery-good powerup in fault

mode. Otherwise, the fault relay transitions to the Normal state.

Normal State

The fault relay can transition to either the Idle state or the Fault state from

the Normal state. If power is turned off, the fault relay transitions to the

Idle state. If a fatal error is detected, the fault relay transitions to the Fault

state.

Overview

Fault Relay

Operation Details

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