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4-4

Installing 575 System Hardware SIMATIC 545/555/575 System Manual

4.3 Features Required of a Third-Party VMEbus Base

In order to use a 575 CPU in a third-party VMEbus base, the base must

conform to the following requirements:

• Each 575 CPU must be supplied with +5 V STDBY power, in order to

avoid unpredictable operation. Table 4-5 in Section 4.15 and Table B-4

in Appendix B list the requirements for the 575 CPU that you are

using. Note that if you connect +5 V STDBY to +5 V, you will need to

reload the user program in each of the installed 575 CPUs after every

power cycle.

WARNING

The +5 V STDBY power must be supplied to each 575 CPU.

A 575 CPU without this +5 V STDBY power supply may appear to operate

properly; nevertheless, erratic and unpredictable operation can occur that

could result in death or serious injury to personnel, and/or damage to

equipment.

The +5 V STDBY power must meet the requirements for the 575 CPU. (See

Table 4-5 in Section 4.15 and Table B-4 in Appendix B.)

• The VMEbus power monitor function must be supplied. The power

monitor must provide both SYSRESET* and ACFAIL*.

To use the 575 CPU as the slot 1 master (that is, as system controller) in a

third-party base, you must provide a means for the 575 to determine the

condition of the battery. A high (+5 V) signal on the slot 1 BGIN2* line

indicates a charged battery; a low (ground) signal indicates an absent or

discharged battery. You must provide a way to force a battery-bad indication

(BGIN2* driven low) in order to perform a battery-bad restart.

NOTE: If BGIN2* is left open, then the battery test always indicates a

charged battery, and a battery-bad restart is not possible.

The 575 CPU installed in slot 1 tests the condition of the battery once every

minute: it drives the BGIN0* and BGIN1* signals to the low state for 100

milliseconds and then examines the BGIN2* signal. In the 575 VMEbus

base, this is used to place the battery under load so that the battery status

reflects the battery’s true condition. You can implement external circuitry to

provide a similar capability for your third-party base, if desired.

VMEbus Base

Requirements

Determining the

Condition of the

575 CPU Battery

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Siemens SIMATIC TI500 Especificaciones Pagina 87