Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois

60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com

FEATURES

• Wide Variety of Input Ranges

• Standard Package and Pin-out

• Single 5V Power Supply

• 12-Bit Resolution

• Optical Isolation from Input to

Output

• Intermix With Digital Modules on

the Same Rack

• Meets the Requirements of IEEE

472

• UL, CSA, CE Certified (OpenLine only)

CIRCUITRY: Voltage Output

Analog Current Input Modules

73L-II

73G-II

G5: 0-5A

G5: 4-20mA

3

4

5

RECTIFY,

FILTER,

AMPLIFY

1

2

10K

Ω

+5 V

GROUND

5A SECONDARY

TRANSFORMER

OPTICAL

ISOLATION

VOLTAGE

CONTROLLED

OSCILLATOR

OUTPUT

DRIVER

CIRCUIT

CURRENT

SOURCE

SQUARE-

WAVE

OUTPUT

+5V

3

4

5

GROUND

AMP

V/F

DC/DC

CONVERTER

FILTER &

BUFFER

SQUARE-

WAVE

OUTPUT

+

–

1

2

10K

Ω

˜

CURRENT

SOURCE

OPTICAL

ISOLATION

ISOLATED

DC/DC

CONVERTER

5.23K

10K

CHANNEL A

CHANNEL B

Vs

µP

CH. A

A/D

CH. B

SIGNAL

CONDITIONING

AND

FILTER

SIGNAL

CONDITIONING

AND

FILTER

I/O MODULE

PIN #

TERMINAL

BLOCK #

–

+

–

+

4-20mA

TRANSMITTER

TWISTED

PAIR

TWISTED

PAIR

1

2

3

4

4

3

2

1

5

6

7

8

9

133

Ω

133

Ω

4-20mA

TRANSMITTER

LOOP

SUPPLY

LOOP

SUPPLY

–

+

–

+

MODULE ID

RXD

TXD

Vcc

GND

I/O

30