ID
Index Name
Unit Description
505
0
ENC_CH1_Sel = 3
Encoder selection set to TTL(3)
510
0
ENC_CH1_Num
Encoder gearing: Numerator
511
0
ENC_CH1_Denom
Encoder gearing: Denominator
540
0
ENC_CH1_Abs
Selection of absolute value interface
541
0
ENC_CH1_NpTest
ENC CH1, TEST-MODE: Index pulse signal(s) to Scope
542
0
ENC_CH1_lines
Number of lines (Sin/Cos / TTL encoders)
558
0
ENC_CH1_TTL_SignalType
Channel 1: TTL signal selection
601
0
ENC_CH1_Period
Maximum period of interpolation (TTL encoder)
616
0
ENC_CH1_CycleCount
Sampling cycle in: n x 125 μ (microseconds)
Table 6.8: Parameters for Channel 1 (X7) - TTL encoder
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
64
6 Encoder
6.5.4.2 Sin/Cos encoder
Ch1: SINCOS(1) - Sin/Cos signals
Sin/Cos encoders can ...
a. Be pure incremental encoders
without
an absolute value interface. In this
case,
P 540[0] - ENC_CH1_Abs
must be set to OFF(0).
b. Be incremental encoders
▸
with
an absolute value interface. In this case,
P 540[0] - ENC_CH1_Abs
must be accordingly set to SSI(1), EnDat(2),
HIPER(3) or, in special cases, SSI_CONT(4) so that it will be possible to read
the absolute encoder position for the absolute value initialization routine
once during the initialization phase.
6.5.4.2.1 Purely Sin/Cos
incremental encoders
To run these encoders as purely incremental encoders with a zero pulse on encoder
channel Ch1 (without an absolute value interface), the approach is basically the
same as for purely TTL operation (see Section "TTL encoder" on page 63). The
same parameters apply.
However, there are the following differences:
a. There are no different signal types for the Sin/Cos signal (always 1 Vss for
cosine and sine).
b. The zero pulse is the analog zero pulse typical of Sin/Cos encoders (see the
“Connection for high-resolution encoders” section in the operation manual
MSD Servo Drive Single-Axis System, for example).