Configuration of the TELEFAST base
(Original Document)
About us
Introduction
The base is configured by setting the 4 micro-switches, which are located under the connector to the right of this.
They make it possible to inhibit the encoder outputs and to define the number and the type of encoders connected to the TELEFAST base.
Illustration:
Inhibiting the encoder outputs
This micro-switch chooses the state of the 2 inhibition commands (3ST0 and 3ST1) of the encoder outputs.
Illustration
Description
The encoder outputs are at high impedance with a 3ST0 or 3ST1 command active at 0.
The encoder outputs are at high impedance with a 3ST0 or 3ST1 command active at 1.
Number of encoders connected to TELEFAST
This micro-switch makes it possible to define the number of encoders connected to the TELEFAST base (1 or 2 parallel output absolute encoders).
Illustration
Description
An encoder is connected to the base.
Two encoders are connected to the base.
If the number of connected encoders is odd and the number of TELEFAST in series is equal to 2 or 3 for one counting channel, the TELEFAST must be configured so that the sum of the encoders equals 4.
With 2 TELEFAST bases
This table shows the configuration if there are two TELEFAST bases:
Hardware configuration (number of encoders per TELEFAST)
TELEFAST micro-switch
Address
Action
0
1
AD0
AD1
2 encoders on TELEFAST 0 and
1 encoder on TELEFAST 1
ON
ON
0
0
1
1
0
1
0
1
Reading the TELEFAST 0 encoder 0
Reading the TELEFAST 0 encoder 1
Reading the TELEFAST 1 encoder
Reading the TELEFAST 1 encoder
1 encoder on TELEFAST 0 and
2 encoders on TELEFAST 1
ON
ON
0
0
1
1
0
1
0
1
Reading the TELEFAST 0 encoder
Reading the TELEFAST 0 encoder
Reading the TELEFAST 1 encoder 0
Reading the TELEFAST 1 encoder 1
With 3 TELEFAST bases
This table shows the configuration if there are two TELEFAST bases:
Hardware configuration (number of encoders per TELEFAST)
TELEFAST micro-switch
Address
Action
0
1
2
1 encoder on TELEFAST 0
1 encoder on TELEFAST 1
and
1 encoder on TELEFAST 2
ON
OFF
OFF
0
0
1
1
0
1
0
1
Reading the TELEFAST 0 encoder
Reading the TELEFAST 0 encoder
Reading the TELEFAST 1 encoder
Reading the TELEFAST 2 encoder
1 encoder on TELEFAST 0
1 encoder on TELEFAST 1
and
1 encoder on TELEFAST 2
OFF
ON
OFF
0
0
1
1
0
1
0
1
Reading the TELEFAST 0 encoder
Reading the TELEFAST 1 encoder
Reading the TELEFAST 1 encoder
Reading the TELEFAST 2 encoder
1 encoder on TELEFAST 0
1 encoder on TELEFAST 1
and
1 encoder on TELEFAST 2
OFF
OFF
ON
0
0
1
1
0
1
0
1
Reading the TELEFAST 0 encoder
Reading the TELEFAST 1 encoder
Reading the TELEFAST 2 encoder
Reading the TELEFAST 2 encoder
Type of encoders connected to TELEFAST
These micro-switches make it possible to define the type of encoders connected to the TELEFAST base. The following tables show the performance characteristics of the encoder/TELEFAST link, according to the code chosen by the micro-switches:
Table 1
Encoders with positive logic outputs, Totem pole outputs, TTL outputs and NPN open collector outputs coded in Gray
Max.length
encoder/
TELEFAST
Max. frequency for changing least significant bit
50 m
75 kHz
Table 2
Encoders with negative logic outputs, Totem pole outputs, TTL outputs and NPN open collector outputs coded in Gray
Max.length
encoder/
TELEFAST
Max. frequency for changing least significant bit
50 m
75 kHz
100 m
40 kHz
200 m
5 kHz
Table 3
Encoders with positive or negative logic outputs,
NPN open collector, binary coded
Max. length
encoder/
TELEFAST
Max. frequency
for changing least significant bit
10 m
40 kHz
30 m
20 kHz
50 m
5 kHz
NOTE: For encoders with positive logic, TTL and Totem pole outputs, it is possible to go beyond these capacities, without exceeding the recommendations of the encoder manufacturers.