Siemens SIMATIC Rack PC 840 Manual page 44

Setting Up and Operating the SIMATIC Rack PC 840
Caution
!
Risk of damage to the Rack PC!
The interface port may be damaged if you confuse the connections or use the
wrong connecting cables.
Make sure the TTY cable of the Rack PC is plugged into the COM 1 / TTY
port and not into the LPT 1 port.
Before inserting the connecting cables, the electrostatic charge in your body, the
device and the connecting cables must be brought to the same potential. Briefly
touch the sheet metal case to do this.
Use only original cables to establish the connection to the programmable
controller.
Connecting the Rack PC via an Adapter
The 6ES5 734-2BD20 standatd connecting cable is required for connection to a
programmable controller. An adapter is available for connecting the
programmable controller using old standard cables.
Tabelle 3-1
Port
TTY port
(COM 1) (COM 1)
In order to maintain a data transfer rate of 9600 bps up to a distance of 1000 m
(3300 ft), the receiving diode is connected to ground (reference) via the connecting
cable.
Notice
You can obtain lengths differing from the standard connecting cable
(6ES5 734-2BD20) under the order number 6ES5 734-2xxx0, whereby xxx stands
for the length code.
3-14
Adapter for Rack PC Connection
Link
Rack PC to SIMATIC-S5 program-
mable controller mable controller
Connecting Adapter
Cable
Order No:
6ES5 734-2BD20
6ES5 731-1xxx0 6ES5 731-6AG00
15-pin
6ES5 731-0xxx0 6ES5 731-6AG00
25-pin
SIMATIC Rack PC 840 Manual
A5E00104826-03