User Manual M3000® Automation System / MSC II (Moog Servo ...

10 MSC II (Moog Servo Controller) Digital Sensor Interfaces
A
B
Reversal Point
Counter: 6 5 6 7 8 10 11 12 13 14 15 16
Figure 67: Timing of Pulse Train Incremental Encoder with positive logic
10.13.4.3 Incremental Encoder (Pulse Train negative logic)
• On the left side of the dotted line, while B signal is high, the counter becomes
decremented.
• On the right side, while B signal is low, the direction has changed. Now
the counter becomes incremented.
A
B
Please make sure that any changes at B signal happen at least 100 ns
before a rising edge at A signal.
Reversal Point
Counter 6 5 6 7 8 10 11 12 13 14 15 16
Figure 68: Timing of Pulse Train Incremental Encoder with negative logic
10.13.4.4 Incremental Encoder (Frequency Modulation positive logic)
• On the left side of the dotted line, while B signal is low, any rising edges
of A signal decrements the counter state.
• On the right side, while A signal is low, the direction has changed. Now
any rising edges of B signal increments the counter state.
A
B
Counter 6
5
Reversal Point
6 7 8 9 10 11 12 13 14 15
Figure 69: Timing of Frequency Modulation Incremental Encoder with positive logic
10.13.4.5 Incremental Encoder (Frequency Modulation negative logic)
• On the left side of the dotted line, while B signal is high, any falling edges
of A signal decrements the counter state.
• On the right side, while A signal is high, the direction has changed. Now
any falling edges of B signal increments the counter state.
A
B
Reversal Point
Counter 6
5 6 7 8 9 10 11 12 13 14 15
Figure 70: Timing of Frequency Modulation Incremental Encoder with negative logic
Timing of Pulse Train
Incremental Encoder
with positive logic
Timing of Pulse Train
Incremental Encoder
with negative logic
Timing of Frequency
Modulation Incremental
Encoder with positive
logic
Timing of Frequency
Modulation Incremental
Encoder with negative
logic
© Moog GmbH User Manual M3000 ® and MSC II (CA65865-001; Version 1.1, 08/08) 107