Siemens S7-1200 - Page 972

Technical specifications
A.14 Communication interfaces
S7-1200 Programmable controller
972 System Manual, 03/2014, A5E02486680-AG
AS-Interface terminals
The removable terminal for connecting the AS-i cable is located behind the lower cover on
the front of the AS-i master CM 1243-2.
If the AS-i shaped cable is used, you can recognize the correct polarity of the cable by
means of the symbol
.
Information on how to remove and re-install the terminal block can be found in the system
manual "SIMATIC S7-1200 Programmable Controller" (Order No.: 6ES7298-8FA30-8AH0).
Note
Maximum current carrying capacity of the terminal contacts
The current carrying capacity of the connection contacts is max. 8
A. If this value is
exceeded on the AS
-i cable, the AS-i master CM 1243-2 must not be "looped in" to the AS-
i
cable, but must instead be connected via a spur line (only one connection pair assigned on
the AS
-i master CM 1243-2).
Please also ensure that the cables used are suitable for operating temperatures of at least
75°C if current is being con
ducted via the AS-i master and currents of greater than 4
amperes are present.
You will find additional information on connecting the AS
-i cable in the section "Installation,
connection and commissioning of the modules" in the manual "AS
-i Master CM 1243-2 and
AS
-i data decoupling unit DCM 1271 for SIMATIC S7-1200".
Terminal assignment
Label
Meaning
ASI+
AS-i connection – positive polarity
ASI–
AS-i connection – negative polarity
Functional ground