It251_02c_oi_e.doc / Apr-16
Page 9 / 16
Configuration
DIL4
8 7 6 5 4 3 2 1
on on
A
B
1**
Output direction
standard
on off
A
B
2
off on
A
B
3
on on
1
Input direction
standard
on off
A
B
2*
off on
A
B
3*
on
Connects the metallic housing of SUB-D-connector “RS422
Input” to terminal 12
off
Metallic housing of the SUB-D-connector
“RS422 Input” is potential-free
on
Connects the metallic housing of SUB-D-connector “RS422
Output” to terminal 12
off
Metallic housing of the SUB-D-connector
“RS422 Output” is potential-free
on
HTL Inputs disabled
off
HTL Inputs enabled
on
TTL / RS422 Inputs disabled
off
TTL / RS422 Inputs enabled
*) Where your application uses input format 2 or 3 to indicate the direction,
you should ensure that changes of direction occur always while the pulse
lines are low. Otherwise there is a risk of cumulating error pulses at the
output with frequent changes of direction.
**) Also from input signals according to direction standards 2 or 3, the unit
can generate a quadrature output with A/B phase displacement, according to
direction standard 1. However, with the divider set to 1:1, the phase
displacement then is constant in time, i.e. the phase between A and B
corresponds to 90° only at a certain input frequency, and becomes smaller
with lower input frequencies.
This, in general, is not a restriction for proper detection of the direction,
because practically every counter or position controller can clearly interpret
