Addressing
S5-95F
6.3
Digital Modules
Digital modules can be plugged into all slots.
Only two information states ("0" or "1", "OFF" or "ON") per channel can be transferred from or to
a digital module.
Each channel of a digital module is displayed by a bit. This is the reason that every bit must be
assigned its own number. Use the following form for a digital address:
Figure 6-4. Configuration of a Digital Address
x
. y
Bit number (channel number)
Byte number (slot number)
The address "X.Y" consists of two components:
Byte Address X (Slot Number X)
The byte address is the same as the number of the slot the module is plugged into.
Channel Number Y (Bit Address Y)
The channel number comes from the connection of the actuators or sensors to the terminals of the
terminal block.
The assignment for the channel number and the terminal number is printed on the frontplate of the
module.
Example:
Address Assignment
You are connecting a 2-wire BERO proximity limit switch to an 8 x 24-V DC digital input module
(6ES5 431-8MA12) at terminal 3. The other wire is routed to an L+ terminal block. The module is
plugged into slot 3.
This defines the address used by the control program to evaluate the signal states of the BERO.
•
The byte address is 3 since the module is plugged into slot 3.
•
As shown on the frontplate, the terminals for channel number 1 are used.
•
The complete address for the BERO switch is 3.1.
6-4
EWA 4NEB 812 6210-02
