Beckhoff M3120 Manuel d'utilisateur télécharger pdf (Page 3)

M3120 Incremental encoder 4x Beckhoff II/O-Lightbus

Date 20.10.94 Version 1.1 Page 3 of 14

1. Function description hardware

M3120

The periphery module M3120 establishes the connection of four incremental encoders for the

II/O-Lightbus system. It contains three separate power supplies for logic (5V) and pick off

power supply (5/15V) and the level adjustment from 15 V down to 5V. 5 V or 15 V encoder

can be connected to the incremental box M3120, either with or without complementary

channels.

All digital functions are integrated in four separate periphery controller (LCA circuit):

- 24 bit UP/DOWN counter with a limiting frequency of 1.25 MHz.

- Input "counter disable"

- 24 bit latch for counter position at zero impulse.

- Squareness decoder with adjustable 1, 2 or 4 times evaluation

- Selective computation of complementary signals (fewer interferences)

- Connection to the II/O-Lightbus with all functions:

addressing, interrupt, address counting, decrease transmission intensity,

cycle and error LED

- Read, set and activate commands for counter and zero impulse register via fibre

optic II/O-Lightbus

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Beckhoff M3120 Manuel d'utilisateur Page 3