User`s manual

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XP8000 Series (PLCBus

)

Z-World 530-757-3737 8

Setting Up Your Conditioned Inputs

As they comes from the factory, the conditioned inputs have a

0–10V input range. The socketed resistors are 2370 Ω (gain) and

39.2 kΩ (bias) respectively.

You can have any input range you want, simply by changing

the gain and bias resistors. The following tables present some

useful input ranges. The table values require 1% resistors and

have been adjusted from the theoretical values to account for

tolerance.

Input Range (V) Gain R

GAIN

(Ω)R

BIAS

(Ω)

–10.0 to +10.0 0.125 1180 8060

–5.0 to +5.0 0.250 2370 6650

–2.5 to +2.5 0.500 4750 4990

–2.0 to +2.0 0.625 5900 4530

–1.0 to +1.0 1.250 11.8K 2870

–0.5 to +0.5 2.500 23.7K 1690

–0.25 to +0.25 5.000 47.5K 931

–0.10 to +0.10 12.500 118 392

0 to +10.0 0.250 2370 39.2K Default

0 to +5.0 0.500 4750 20.0K

0 to +2.5 1.000 9530 10.0K

0 to +1.0 2.500 22.6K 4020

Using the Unconditioned Channels

The unconditioned channels are CH4–CH10.

ADC

CH[4–10]

10K

AIN[4–10]

VREF+

+5ANA

For optimal results, drive the unconditioned inputs with low-

impedance voltage sources. Operational amplifiers (such as the

LM660) are ideal for the purpose. High-impedence signal

sources are susceptible to noise.

Low-Pass Filter

The 0.01 µF capacitors in the op-amp circuitry function as low-

pass filters. The filter characteristics depend on the resistors

you select. The 3dB corner frequency is given by

3dB

2π × R

GAIN

× 0.01µF

If the input range is 10V, for example, the gain resistor is 2370Ω

and the 3dB corner frequency is 6715.4 Hz.

Drift

The AD680JT voltage reference has a typical drift of 10 ppm per

°C and a maximum drift of 30 ppm per °C. These values corre-

spond to 25 (typ) and 75 (max) µV per °C and 1.75 (typ) and

5.25 (max) mV over the range 0–70°C.

The LMC662C op-amp has an offset voltage drift of 1.3 µV per

°C, or 910 µV over the range 0–70°C.

Other contributers to overall drift are the 10K resistors R21–

R24. These have temperature coefficients of ±100 ppm per °C,

or 1W per °C. But, because they are small, surface-mounted re-

sistors, all close to each other, their temperature deviations

match closely.

Using the Analog Inputs

Software is available to read and to calibrate the analog inputs.

Once calibrated, the calibration values reside in non-volatile

memory. All subsequent analog readings will use the calibra-

tion values and give the best possible value.

ADC4 Board IDs

You can address up to 16 ADC4 boards on a single bus, since

four different PALs are available and the address jumpers J4

and J5 can be set four different ways:

0000 1100 ppxy

x = 1 when J5 is open, else 0

y = 1 when J4 is open, else 0.

The bits pp are determined by the PAL number.

Specifications

A/D12

Board Size

2.835 × 3.525

Operating Temp –40°C to +70°C

Humidity 5% to 95% non-condensing

Power

24VDC, 100 mA

Provides Eight configurable 12-bit channels. (16 chan-

nels if single-ended, unity gain.)

ADC4

(XP8500)

Board Size 2.835 × 2.12 × 0.75

Operating Temp –40°C to +70°C

Humidity 5% to 95% non-condensing

Power

24VDC, 32 mA

Provides Eleven 12-bit ADC channels, 4 with signal

conditioning.

DAC Boards

The DAC2

Z-World’s DAC2 (XP8600) expansion boards add digital-to-ana-

log conversion (DAC) channels to your control system. Up to 64

DAC2

boards can be addressed on a single PLCBus.

–24V

C15

High-Side

Switch

(optional)

Reg.

+15V+

C16

REF+

U13

DAC

C5 C2

U10

(J4)

Latch

U11

Op-Amps

PAL

U12

DAC

The DAC2 board has two digital-to-analog output channels.

Each of these can be operated either as a voltage source or a

current source. The default range for voltage output is 0–10V.

The default range for current output is 0–22 mA. The D/A

chips—AD7543s—have a linearity of ±1 LSB and a gain stabil-

ity of about 5 ppm per °C.