C h a p t e r 1 I n t r o d u c t i o n
8
ADVANCED MICRO CONTROLS INC.
Other Compatible Transducers
In addition to AMCI transducers, the 1761H module now directly support Autotech multi-
turn transducers. The Autotech models supported are:
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All SAC-RL210-G128 Transducers. (Size 40, NEMA 13)
Autotech also manufactures SAC-RL210-G64 transducers. These transducers are not
supported by AMCI.
You select between AMCI and Autotech transducers over the backplane from the processor.
The module then sets the reference voltage according to your selection. When using Autotech
transducers, only 10 bit (1024 counts) per turn resolution is supported. AMCI’s HTT400 -180 is
a direct bolt-in replacement for the Autotech RL210. AMCI strongly suggests using this trans-
ducer instead of the Autotech RL210.
Programmable Number of Turns
The maximum number of turns a transducer can encode is fixed by the gearing inside of it.
However, the 1761H has the ability to divide this maximum number of turns into smaller multi-
turn cycles. The module does this without loss of absolute position within the smaller cycle. An
example of this feature is shown in figure 1.5. It shows how the 180 turn mechanical cycle of an
HTT-20-180 can be broken down into three electronic cycles of sixty turns each. The 180 turn
cycle could also be broken down into sixty cycles of three turns each.
180 Turn Cycle
Mechanical fixed by internal gearing.
HTT-20-180
60 Turn Cycle
60 Turn Cycle
60 Turn Cycle
Electronic Electronic Electronic
Figure 1.5 Programmable Number of Turns Example
You program the number of turns you want the module to decode over the backplane.
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When using a 100 turn transducer, the number of turns is programmable to 1, 2, 4, 5,
10, 20, 25, 50, or 100.
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When using a 180 turn transducer, the number of turns is programmable to 1, 2, 3, 4,
5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, or 180.
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When using a SAC-RL210-G128, the number of turns is programmable to 1, 2, 4, 8,
16, 32, 64, or 128.
To the 1761H, the HTT-20-1,000 and HTT-20-1,800 transducers appear to be
HTT-20-100 and HTT-20-180 transducers. Therefore, when using the 1,000 or
1,800 transducers, program the Number of Turns using the 100 or 180 turn
values above. The actual Number of Turns that must be completed will be ten
times (10x) the programmed value.
