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SIMATIC 545/555/575 System Manual

Installing 575 System Hardware

A 575 secondary is any 575 that is not installed in slot 1 and is not

configured by the dipswitch as a primary. If you want to replace a 575

secondary, follow the steps below:

NOTE: Read and abide by the warnings and cautions at the beginning of

this section.

1. If possible, save the memory of your system.

2. Ensure that all power is disconnected from the VMEbus base. You do

not have to disconnect the battery to replace a 575 secondary.

3. Remove the old 575 secondary.

4. Your new 575 secondary must conform to the dipswitch configuration

established by your 575 primary. If the primary 575 CPU is set to the

USER-CONFIGURED mode, then all 575 secondaries must also be set to

the

USER-CONFIGURED mode. (575–2104 CPUs require an I/O annex

card in order to select user-configured mode.)

NOTE: You must know the dipswitch configuration of your primary 575

before you can correctly configure your 575 secondary. All primary and

secondary CPUs must have the same dipswitch settings for switches SW3

through SW6. Refer to Section 4.10 for information about dipswitch

configuration.

5. Install the new 575 secondary.

6. Power up the 575 system.

The new 575 secondary performs a battery-bad restart and then

transitions to FAULT mode. The PCG LED does not light up. (The

other 575 CPUs restart according to the battery status.)

7. The primary 575 asserts SYSFAIL*. The SYF LED lights up on the

primary 575. (See Figure 4-19 for the location of the LEDs.) This allows

you to reload the replaced CPU prior to starting control from other

CPUs.

8. Use TISOFT to execute AUX 11 (partial restart) or AUX 12 (complete

restart) to clear the fatal error.

9. Load your program in the new 575 secondary.

Guidelines for

Replacing a 575

Secondary

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