OPTO 22 G4LC32, User Manual

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G4LC32 User’s Guide
LOCAL COMMUNICATIONS
Overview
The Local Bus is a high speed parallel interface communicating over 1.4 megabi•ts per second and can be up to
200 ft. in length. It connects the G4LC32 controller to local digital and analog I/O units.
The following table lists some of the Local Bus specifications.
Local I/O Bus Specifications
No. of Active Lines 12
No. of Ground Lines 17
No. of Conductors in Cable 34
Cable Type Flat Ribbon
Bus Drivers Open collector
Impedance 100 ohm
Propagation Delay 1.7 ns/ft.
Max Bus Length 200 ft.
Bus Times
Adjusts between 200 and 700 ns, and
are distance proportional
Reset Line None
Interrupts Available
Digital Response Time 1 ms + Local Bus transmission time
Analog Response Time 3 to 7 ms + Local Bus transmission time
Bus Speed 1.4 MHz
Cables and Connectors
This table lists parts for making custom local bus cables.
Manufacturer
Ribbon Cable 3M P/N Alpha P/N
Regular 3365/34
3580/34 or
3583/34
Ground Planed
3469/34 or
3476/34
3584/34
Jacketed 3603/34 3598/34
Jacketed and Ground
Planed
3517/34 3590/34
3M
Circuit
Assembly
Connectors 3414-7000 CA-34IDS-B
COMMUNICATIONS AND CABLES
5-9