Addressing; Basic Rules For Addressing; Addressing Example - Festo CPX-E-EP Translation Of The Original Instructions

Function
The address assignment (number of allocated inputs and outputs) on the system CPX-E must be
determined prior to commissioning.
• A maximum of 10 I/O modules + bus module is permitted in one system CPX-E.
• The address space of a system CPX-E is limited. The bus module provides the system CPX-E with a
maximum address space of 64 bytes for inputs and 64 bytes for outputs.
• Activated diagnostic functions as well as status bits or the I/O diagnostic interface reduce the size
of the available address space.
2.3

Addressing

2.3.1

Basic Rules for Addressing

– The address assignment of the inputs does not depend on the address assignment of the outputs.
– The numbering goes from left to right.
– The bus module counts as a module with 0 inputs and 0 outputs when the status bits and the I/O
diagnostic interface are deactivated.
– Activated status bits occupy 8 inputs.
– An activated I/O diagnostic interface occupies 16 inputs and 16 outputs.
– The inputs and outputs of different module types are assigned separately from each other. The
following sequence applies:
– Bus module with status bits or I/O diagnostic interface (if activated via DIL switch)
– Analogue modules
– Technology modules
– Digital modules
2.3.2

Addressing Example

Fig. 4
The address assignment for the system CPX-E presented is shown in è Tab.
12
1 Bus module CPX-E-EP (with status bits)
–Status bits activated
–I/O diagnostic interface deactivated
2 Digital input module CPX-E-16DI
3 Digital output module CPX-E-8DO
4 Digital output module CPX-E-8DO
5 Analogue input module CPX-E-4AI-U-I
6 Analogue output module CPX-E-4AO-U-I
Festo — CPX-E-EP — 2020-01a