
The TTL interface accepts various TTL signal types, which can be selected using
P 558[0] - ENC_CH1_TTL_SignalType:
l
(0)AF_B - A/B tracks (forward counting, X4 encoding) - AB
l
(1)AR_B - A/B tracks (reverse counting, X4 encoding) - AB_inv
l
(2)ABDFN - A: Clock (falling edge), B: Direction (1 = positive) - PulseDir
l
(3)ABDRP - A: Clock (rising edge), B: Direction (1 = negative) - PulseDir_inv
l
(4)reserved
A maximum interpolation period, in ms (milliseconds), can be configured for the TTL
interface using P 601[0] - ENC_CH1_Period. Within this context, Period is the
maximum time of “no activity” since the last TTL counter event:
l
Period = 0: Function disabled (default)
l
Period > 0 (=n ms): If no counter event is registered in n ms, the speed will be
set to 0.
Zero pulse
There is no parameter for activating the zero pulse evaluation here, as this
evaluation is controlled exclusively based on the homing mode (see Section
"Homing" on page 252). However, setting P 541[0] - ENC_CH1_NpTest to 1
provides a test mode that can be used during commissioning in order to be able to
activate the zero pulse evaluation even without homing. Scope signals 1014 and
1016 can be used to view a received zero pulse within this context. This test mode
must be disabled during normal operation (P 541[0] = 0).
Commutation
Motor operation with pure incremental encoders needs for the auto commutation
function to be enabled without fail. For details see Section "Synchronous motor auto
ID No.: 0842.26B.5-01 Date: 09.2020
ServoOne - Device Help
65
6 Encoder
6.5.5.1.2 TTL incremental encoder with SSI absolute value inter-
face
See Section "SinCos incremental encoders with absolute value interface" on page
66 and in specialSection "SSI absolute value interface" on page 68.
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 6.9: Parameters for Channel 1 (X7) - TTL encoder