User`s manual
XP8300/XP8400/SE110076 s Connecting and Mounting Multiple Boards
Connecting Multiple Boards
Eight or more expansion boards can be connected (daisy chained) at one
time. The actual number of expansion boards may be limited by capacita-
tive loading on the PLCBus.
Be sure that each expansion board has a unique address to prevent commu-
nication problems between the controller and the expansion board.
Follow these steps to install several expansion boards on a single PLCBus.
1. Place all expansion boards right side up.
2. Use the ribbon cable supplied with the boards.
3. Connect one board to the main controller.
4. Connect another expansion board to the first expansion board, connect-
ing each boards header P1 to the adjacent boards header P2.
Figure C-1 illustrates a controller with expansion boards attached.
Figure C-1. Connecting Multiple Expansion Boards
Do not twist the ribbon cable or mount the expansion boards
upside down! Damage may occur. Be sure Pin 1 of P1 and P2
of each board matches up with Pin 1 of the previous board.
Pin 1 should be at the lower right when the expansion board is
right side up, that is, the board markings are right side up.
When several expansion boards are connected, there may be a voltage
drop along the network of expansion boards. No action is necessary as
long as the digital voltage, VCC, is greater than 4.9 V on the last board.
VCC can be measured at pin 2 on header P1, and GND is pin 1
on header P1.
EPROM
RAM
PIO
Z180
J2
J4
1
1
1
1
1
1
1
1
1
J1
XP8100
XP8400 Controller
Relay 0
Relay 2
Relay 4
Relay 5
Relay 7
Relay 1
Relay 3
Relay 6
P1
H1
H3
U5
U6
Heat Sink
!