Function description hardware – BECKHOFF M3120 User Manual
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):
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24 bit UP/DOWN counter with a limiting frequency of 1.25 MHz.
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Input "counter disable"
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24 bit latch for counter position at zero impulse.
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Squareness decoder with adjustable 1, 2 or 4 times evaluation
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Selective computation of complementary signals (fewer interferences)
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Connection to the II/O-Lightbus with all functions:
addressing, interrupt, address counting, decrease transmission intensity,
cycle and error LED
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Read, set and activate commands for counter and zero impulse register via fibre
optic II/O-Lightbus