Siemens SIMATIC TI500 Spécifications Page 136

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4-53
SIMATIC 545/555/575 System Manual
Installing 575 System Hardware
All VMEbus masters (including the 575 CPUs) require access to the
VMEbus daisy-chain control signals, including the bus grant and interrupt
acknowledge signals:
IACKIN* BG1IN* BG2OUT*
IACKOUT* BG1OUT* BG3IN*
BG0IN* BG2IN* BG3OUT*
BG0OUT*
Refer to Table 4-7 for pinouts.
Place any board that does not provide the BGxOUT* signals to the right of
any board that requires these signals. All of the 575 boards (CPUs and I/O
modules) pass through the daisy-chain signals.
Third-party slaves may occupy any unused address. There are two ways to
assign addresses to third-party slaves:
Calculate used address spaces and hard-assign an address.
Design the software on a third-party master CPU to log in slave boards
and to assign their addresses: refer to the SIMATIC 575 Interboard
Communication Specification (PPX:5758103).
!
WARNING
Memory overlaps in board addresses can cause erratic system operation.
Erratic system operation can cause death or serious injury to personnel, and/or
damage to equipment.
To minimize the risk of erratic system operation, ensure that there are no
memory overlaps in board addresses.
Daisy-Chain
Signals
Assigning
Addresses to
Third-Party Slaves
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