3
Mounting and installation
18
Festo – P.BE-CPX-FB37-EN – 1406NH – English
3.2.6
Setting the diagnostics mode (Remote I/O operating mode)
The diagnostic mode is available only in the remote I/O operating mode.
Note
1. The diagnostics mode reduces the available address space.
Use of the diagnostics mode (status bits or I/O diagnostics interface) occupies 16 I or
16 I/O bits and thus reduces the number of I/O bits which are available for module
communication. In this way, the number of addressable modules is reduced in favour of
additional status or diagnostic information.
2. When using the
fixed I/O size (CPX-FB38 mode)
, subsequent activation of the dia-
gnostics mode requires a reconfiguration.
A detailed description of the addressing process and various addressing examples for the
CPX-FB38 mode can be found in the description of the bus node CPX-FB38
(
P.BE-CPX-FB38).
Set the diagnostics mode of the bus node with DIL switch 2.
Diagnostics mode (remote I/O operating mode)
Setting DIL switch 2
I/O diagnostics interface and status bits are switched off
(+ 0 I/O bits)
DIL 2.1:
OFF
DIL 2.2:
OFF
(factory setting)
Status bits are switched on
(+ 8 (16) I bits)
1)
DIL 2.1:
OFF
DIL 2.2:
ON
I/O diagnostics interface is switched on
(+ 16 I/O bits)
1)
DIL 2.1:
ON
DIL 2.2:
OFF
1)
The diagnostics mode (status bits or I/O diagnostics interface) occupies 2 bytes or 4 bytes of address space (16 I-bits or 16
I/O-bits; 8 I-bits remain unused in the status bits mode)
Tab. 3.3
Setting the diagnostics mode (Remote I/O operating mode)
