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4-41
SIMATIC 545/555/575 System Manual
Installing 575 System Hardware
VMEbus bases provide a daisy-chain interrupt feature which passes
through every module installed in the base. When a base slot is skipped
(i.e., left empty), this daisy chain is broken, unless provision is made to pass
the signals across the empty slot. For this reason, the PPX:5752130 16-slot
VMEbus base provides a set of daisy-chain dipswitches to the immediate
left of connectors J1 through J15 on the backplane.
S6
Slide all switches to the right (On)
if the corresponding connector is skipped.
J2 J3 J4 J5J1
S2 S3 S4 S5
For example, if slots
J1, J2, J4, and J5 have
modules installed, set
switches in S3 to the
right (On) to pass the
signals across the empty
J3 slot to the connector
at J4.
Empty slot
Leave switches set to
the left (Off) position for
all slots which will have
modules installed.
Switch
1
2
3
4
5
68
Signal Name
BG0
BG1
BG2
BG3
IACK
Not used
Daisy-Chain
Signal Lines
Figure 4-20 Setting Daisy-Chain Signal Dipswitches on VMEbus
Backplane
NOTE: Whenever a 575 module with a 1-inch or 1.6-inch front bezel is
installed, a slot is skipped. Set the daisy-chain switches corresponding to
the empty slot to pass the signals on to the next slot, and use blank filler
bezels if there is empty space.
VME I/O slot numbering is automatic; for example, to find the module
TISOFT shows is in slot three, count SIMATIC VMEbus I/O modules from
left to right to the third module.
If you want a 575 CPU to function as your system controller, you must
install the 575 CPU in the slot next to the power supply. Board order for
remaining cards, including other CPUs, is unimportant.
Setting the
Daisy-Chain
Switches
Slot Numbering
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