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PK2100

I/O Configurations s 3-13

The diodes on U35 for outputs O8O10 use the PK2100s power supply

directly.

Inductive

load

D.C. in D.C. in

Digital output

channels O8O10

Figure 3-13. Routing PK2100 Power Supply

for Digital Outputs O8O10

The drivers used are the Motorola MC1413B or the equivalent Texas

Instruments ULN2003. One drives outputs O1O7, and the other drives

outputs O8O10, the onboard relays and the beeper. Each driver chip can

dissipate a maximum of 1.25 watts when the ambient temperature is 60°C.

Each output consumes power, depending on the current, as follows.

100 mA 0.10 W

200 mA 0.25 W

350 mA 0.50 W

This limits the maximum current to approximately 150 milliamps per

output if all outputs are turned on at the same time for a 100 percent duty

cycle. The maximum current for any single output is 500 milliamps.

Analog Output

One analog output (DAC) is provided. With Pins 2-3 on Jumper J7

connected, the output can be a voltage (010 volts for PK2100/PK2120

and 07volts for PK2110/PK2130); connecting Pins 1-2 on Jumper J7

turns the output into a current output suitable for driving current loops at

420 mA. The analog output will drive 20 milliamps (15milliamps for

PK2110/PK2130) up to 470 Ω with a resolution of 10bits.

Another 10-bit analog output channel (UEXP) is available if it is not being

used to support the universal inputs.

Communication Interfaces

The PK2100 comes with a full-duplex RS-422/RS-485 serial port that can

operate asynchronously at up to 38,400 baud (57,600 with the optional

9.216-MHz clock upgrade). An RS-232 serial port with two handshaking

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Z-World XP8900 Manual de usuario Pagina 31