User`s manual
Exp-A/D1256 s Getting Started
4. Each expansion board comes with a factory-default board address. If
more than one expansion board of each type is to be used, be sure to
set a unique address for each board.
The following section on Setting Expansion Board Ad-
dresses, and Chapter 8, Software Reference, provide details
on how to set and use expansion board addresses.
5. Power may be applied to the controller once the controller and the
expansion boards are properly connected using the PLCBus ribbon
cable.
Setting Expansion Board Addresses
Z-World has established an addressing scheme for the PLCBus on its
controllers to allow multiple expansion boards to be connected to a
controller.
Remember that each expansion board must have a unique
PLCBus address if multiple boards are to be connected. If two
boards have the same address, communication problems will
occur that may go undetected by the controller.
Exp-A/D12 Addresses
Exp-A/D12 expansion boards are shipped from the factory with no pins on
header J1 connected. Sixteen different PALs are available. There are four
different ways to configure the four pins on header J1, and so up to 64
Exp-A/D12s may be addressed individually over a single PLCBus.
See Chapter 4, Software Reference, for further details on
how to determine the physical address for Exp-A/D12 expan-
sion boards based on which pins on header J1 are connected.
Power
Z-Worlds expansion boards receive power from the controller over the
+24 V line of the PLCBus. An onboard regulator converts this to the
+2.5V/-5 V reference used by the Exp-A/D12 expansion boards. The
Exp-A/D12 draws 100 mA at +24 V.
The Exp-A/D12 may be used with 12 V controllers by replac-
ing the 470 Ω resistor at R2 with a wire jumper, and removing
the 1N5250 zener diode at C50.
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