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SIMATIC 545/555/575 System Manual

Installing 575 System Hardware

The positions of the BASE-ADDRESS switch pair, SW3 and SW4, determine the

base address for the 575 system tables (A24 space) and the 575 Global

Communication Status Registers, or GCSRs (A16 space).

SW5 controls whether the primary 575 CPU issues SYSRESET* when

changing from FAULT mode to PROGRAM mode. When SW5 is set to the

Off position (option

DO NOT ASSERT/WAIT FOR SYSRESET*), the primary 575

CPU performs a coordinated state change from FAULT mode to PROGRAM

mode without issuing SYSRESET*. When SW5 is set to the On position

(option

ASSERT/WAIT FOR SYSRESET*), and the primary 575 CPU is in slot 1,

the primary issues SYSRESET* to recover from FAULT mode. If SW5 is set

to the On position, but the primary 575 CPU is not in slot 1, then the

primary 575 CPU cannot issue SYSRESET*. In this case, to recover from

FAULT mode, you must follow the procedure below.

1. Execute AUX 11 or AUX 12 from TISOFT.

2. Wait at least three seconds.

3. Either perform a power cycle or else issue SYSRESET* from a source

other than the 575 CPUs to put the 575 in PROGRAM mode.

NOTE: A 575 CPU can issue SYSRESET* only if it occupies slot 1.

Table 4-4 summarizes the conditions under which the 575 CPU issues

SYSRESET* or else waits for SYSRESET* during FAULT recovery.

Table 4-4 575 CPU, SW5 On During Fault Recovery

SW6 SW5 Primary Slot 1 Secondary

Issues

SYSRESET*

Waits for

SYSRESET*

Off On X

Off On X X X

Off On X X

In this configuration, the 575 CPUs do not recover from FAULT unless

SYSRESET* is issued.

Setting the Base

Address

Issuing SYSRESET

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Siemens SIMATIC TI500 Especificaciones Pagina 110