Symmetrical 5 V Differential Inputs - Siemens SIMATIC S5 Manual

Standard Function Counter
1.1.3

Symmetrical 5 V Differential Inputs

The differential inputs are located on the 15-pin sub D socket of the module. The differential inputs
interface conforms to the RS422A standard. You can connect 5 V sensors with differential signals to
the differential inputs. Maximum input frequency is 58 kHz. The pulse length of the input signals at
the 5 V differential inputs (signal "0" (0 V) or "1" (5 V) must be at least 8.6 µs.
Unwired ("open") 5 V differential inputs are handled by the IP 265 as differential inputs with signal
state "1" (5 V).
Figure 1-3 shows you where on the 15-pin sub D socket the signal lines of the 5 V sensors are to
be connected. Four pins are reserved on the sub D socket for the two differential inputs. The
remaining 10 pins of the 15-pin sub D socket are irrelevant to the use of the counter function (->
see the IP 265 Manual for further information on the pin assignments of the interface).
STOP RUN
I O
I
N
P
U
T
I
N
O
T
U
E
T
R
P
F
U
A
T
C
E
6
HIGH
L+
SPEED
24 V
SUB
M
CONTROL
6ES5 265-
1 2 3
8MA01
Figure 1-3. Pin Assignments for the 5 V Differential Inputs
Warning
!
All pins not used for the standard function counter must remain inactive.
EWA 4NEB 812 6131-02a
Pin
I
1
N 2
1
11
6 T
3 ... 5
2
12
E
7
3 13
6
R
8
7
4
14
F
9
5
8
15
A
10
C
9 ...
E
15
Construction of the IP 265 Module
Meaning
A CU1
A-N Counter pulse channel 1
irrelevant
B CU2
B-N Counter pulse channel 2
Ground (5 V)
Irrelevant for the standard function
counter
1-3