User`s manual

Exp-A/D12
52 s Overview
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The Exp-A/D12 provides eight channels of 12-bit analog-to-digital (A/D)
conversion. The eight channels can be read as eight differential signals
with software-selectable gain, or as 16 single-ended signals with unity
gain. In addition to unity gain, programmable gains of 2, 6, 22, 42, 102,
and 202X may be selected.
Each Exp-A/D12 board is factory-calibrated. Compensation coefficients
for all A/D channels are stored in the boards EEPROM. The EEPROM
can be read or written by an application.
The Exp-A/D12 receives its power from the PLCBus +24 V. An onboard
voltage regulator (U10) provides +5 V up to 1 A. U6 and U14 provide V,
a regulated -5 V up to 50 mA. U1, an LT1019, provides a precision 2.5 V
reference (VREF+) up to 10 mA. A version of the Exp-A/D12 is available
for use with +12 V controllers.
Like other Z-World expansion boards, the Exp-A/D12 can be installed in
modular plastic circuit-board holders attached to a DIN rail. The
Exp-A/D12 boards can also be mounted, with plastic standoffs, on any
surface that will accept screws. Up to 64 Exp-A/D12 addresses are
possible on a single PLCBus.
For ordering information, call your Z-World Sales Representa-
tive at [phone].