Siemens SIMATIC CP 440 Manual page 158

Connecting Cables
X 27 Connecting Cable (S7/M7 (CP 440) – CP 544, CP 524, CPU 928B, CPU 945,
CPU 948)
The figure below illustrates the connecting cable for a point-to-point connection
between a CP 440 and a CP 544, CP 524, CPU 928B, CPU 945, CPU 948 for
RS 422 operation.
For the connecting cables you require the following male connectors:
At the CP 440 end: 15-pin subminiature D male connector with a screw fixing
at the communication partner: 15-pin sub D male with clip fixing
CP 440
Sender
Receiver
Casing shield
1) In the case of cables longer than 50 m you must solder in a terminating
resistor of approx. 330
Figure B-3
B-6
2 T(A)– R(A)
9 T(B)+ R(B)
4 R(A)– T(A)
1)
11 R(B)+ T(B)
8 GND
Cable type
LIYCY 3 x 2 x 0.14.
T(A)/T(B) and R(A)/R(B)
twisted pairs.
on the receiver for trouble-free traffic.
X27 Connecting Cable CP 440 – CP 544, CP 524, CPU 928B, CPU 945,
CPU 948 for RS 422 Operation (Four-Wire Mode)
Point-to-point connection CP 440 Installation and Parameter Assignment
Communication partner
4
1)
11
2
9
GND 8
Shield
Casing shield
Receiver
Sender
A5E00057742-02