Siemens S7-1200 - Electrical Connections of the AS-I Master CM 1243-2

Technical specifications
A.14 Communication interfaces
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
971
Technical data
Ambient temperature
During storage
During transport
During the operating phase, with vertical installation
(horizontal standard mounting rail)
During the operating phase, with horizontal installation
(vertical standard mounting rail)
-40 °C ... 70 °C
-40 °C ... 70 °C
0 °C ... 55 °C
0 °C ... 45 °C
Relative humidity at 25 °C during operating phase, no
condensation, maximum
95 %
Degree of protection
IP20
Power supply, current consumption, power loss
Type of power supply
DC
Current consumption (typically)
From the S7-1200 backplane bus
200 mA
Total power loss (typical):
• From the S7-1200 backplane bus
• From AS-i cable
1 W
2.4 W
Dimensions and weights
Width
Height
Depth
30 mm
100 mm
75 mm
Weight
Net weight
Weight including packaging
122 g
159 g
A.14.3.2
Electrical connections of the AS-i master CM 1243-2
Power supply of the AS-i master CM 1243-2
The AS-i master CM 1243-2 is supplied over the communications bus of the S7-1200. This
means that a diagnostics message can still be sent to the S7-1200 following failure of the
AS-i supply voltage. The connection to the communications bus is on the right-hand side of
the AS-i master CM 1243-2.