Specifications

IP 240 Operation
5.3 Matching to Encoder Signals
You can connect the following to the IP 240 as position encoders:
• symmetrical incremental encoders with 5 V differential signals complying with RS 422A via
inputs A/A, B/B, Z/Z
and
• asymmetrical incremental encoders with 5 V DC or 24 V DC signals via the inputs A*, B* and
Z*.
You can connect encoders with 5 V DC or 24 V DC signals to the CLK, GT and IN binary inputs.
You can set coding switches for matching the IP 240 to the encoder signals.
5.3.1 Settings for Symmetrical or Asymmetrical Signals
All incremental encoders whose outputs comply with the RS 422 A standard supply symmetrical
signals A, B and Z and their inverted signals. These encoders have line drivers at the outputs, e.g.
26LS31, 75172 or 75174.
All incremental encoders whose outputs produce a 5 V/24 V DC level supply asymmetrical signals
A*, B* and Z*. These encoders have stages which switch to P potential at the outputs or open
collector outputs connected to 5 V/24 V via external pull-up resistors.
Fig. 5-6. Setting Switchbank S4 for Symmetrical or Asymmetrical Signals
Switchbank S4
21
Channel 1
on
off
Channel 2
On: Asymmetrical signals A*, B*, Z*
Off: Symmetrical signals A/ A, B/B, Z/Z
5.3.2 Settings for Encoder Signal Levels
Input signals A*/CLK, B*/GT, Z* and IN may be adapted to 5 V DC input level or 24 V DC input le-
vel. The input signals for channel 1 are set on switchbank S5, and for channel 2 on switchbank S6.
Fig. 5-7. Setting the Encoder Signal Level on Switchbanks S5 and S6
On: 24 V DC input level
Off: 5 V DC input level
Switchbank S5 (S6)
A*/CLK
B*/GT
Z*
IN
21
on
off
3 4
EWA 4NEB 811 6120-02a 5-7