Terminal Assignment Diagram For The Redundant Supply - Siemens Simatic M7-400 Reference Manual

Digital Modules
Terminal Assignment Diagram for Redundant Supply of Sensors
The figure below shows how sensors can additionally be supplied by means of Vs
with a redundant voltage source – for example, via another module).
Figure 4-7
Technical Specifications of the SM 421; DI 16
Dimensions and Weight
Dimensions W H D
(in millimeters)
Weight
Data for Specific Module
Number of inputs
Length of cable
•
Unshielded
input delay
– 0.1 ms
– 0.5 ms
– 3 ms
•
Shielded
input delay
– 0.1 ms
– 0.5 ms
– 3 ms
4-34
Short-circuit-
proof driver
Digital input
module
Terminal Assignment Diagram for the Redundant Supply of Sensors of the
SM 421; DI 16 24 VDC
25 290 210 Rated supply voltage of the
electronics and sensor L+
•
Approx. 600 g
Number of inputs that can be
triggered simultaneously
16
Isolation
•
•
Max. 20 m
Max. 50 m
Max. 600 m
•
Permitted potential difference
Max. 30 m
•
Max. 70 m
Max. 1000 m
Insulation tested with
•
•
Current consumption
•
•
Power dissipation of the
module
S7-400, M7-400 Programmable Controllers Module Specifications
L+
1 L+
Vs
2 L+
M
±
to the sensors
24 VDC
Voltages, Currents, Potentials
24 VDC
Reverse polarity protection Yes
16
Between channels and Yes
backplane bus
Between channels and No
power supply of the
electronics
Between the channels Yes
– In groups of 2
Between the different 75 VDC, 60 VAC
circuits
Channels against 500 VDC
backplane bus and load
voltage L+
Channel groups between 500 VDC
themselves
From the backplane bus Max. 130 mA
From the power supply L+ Max. 120 mA
Typ. 5 W
A5E00069467-07