Datasheet

Ip251_02b_oi_e.doc / Dez-15 Page 8 / 28
4.4. Parallel outputs
The unit provides 25 push-pull outputs which are short-circuit proof. The separate common
output voltage for the outputs must be applied to screw terminal 1 (COM+). The maximum
voltage to COM+ should not exceed +27 V, otherwise no continuous short-circuit proof of
the outputs can be guaranteed.
The voltage drop between COM+ and an output in HIGH state is approx. 1 V (unloaded).
Bit13
Bit 25
Bit 12
Bit 24
Bit 11
Bit 23
Bit 10
Bit 22
Bit 9
Bit 21
Bit 8
Bit 20
Bit 7
Bit 19
Bit 6
Bit 18
Bit 5
Bit 17
Bit 4
Bit 16
Bit 3
Bit 15
Bit 2
Bit 14
Bit 1
R = 600 Ohms
GND
COM +
OUT
Typical output circuit:
SUB-D-25
(female on unit site)
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
4.5. “Data stable” output
The output for bit 25 can be configured as a “Data-stable” signal by means of the DIL-switch.
In this case a LOW state indicates that parallel output data are stable and will not change. The
rising edge of the signal still guarantees stable data and can be used for remote Latch of the
parallel data.
The LOW duration of the signal is at least 1/3 of the SSI Wait Time setting.
12121
Data stable signal
Zone 1: Parallel output data subject to change
Parallel output data are stable
Zone 2: