ZWorld Exp-A/D12, User Manual

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Exp-A/D12 I/O Configurations s 61
How to Set Up An Exp-A/D12
The Exp-A/D12 has four headers for jumper connections, J1–J4 (J5 is
unused). Jumpers are used on header J1 to set the board’s PLCBus
address, as explained in Chapter 4, Software Reference. Jumpers on
header J2 specify the +5 V power supply for the board’s analog circuits,
which is normally derived from the +24 V on the PLCBus. When a +12 V
controller is used, power cannot be obtained from U10, and connecting
pins 1–2 on header J2 then routes VCC to the analog circuits. Header J3 is
used for an upgraded EEPROM, described in Chapter 4, Software Refer-
ence. Jumpers on header J4 route a reference voltage to the A/D converter
chip at U4. The jumper settings for headers J2 and J4 are summarized in
Figure 7-2.
Figure 7-2. Exp-A/D12 Jumper Settings
J2
J4
FD
J2 J4
V+ connected to VCC
V+ connected to + 5 V
from U10
Route pre2.5 V
to A/D converter chip
Route ratiometric voltage
to A/D converter chip
ANALOG VOLTAGE
A/D CONVERTER
REFERENCE VOLATGE