Functions
8.1 PROFIBUS DP
ET 200pro distributed I/O system
178
Operating Instructions, 03/2013, A5E00335544-08
Behavior during the first startup
With option handling, the IM154-1/-2 always goes into cyclic data exchange during the first
startup. However, the I/O are not enabled until valid information about the options is
available from the module. No fault can be detected externally in this state (BF LED of
IM154-1/-2 does not light up). The I/O are not enabled in this state (SF LEDs of electronic
modules light up). Evaluate the data of the feedback interface in order to assess this state.
Behavior during a warm restart
Valid information about the options is stored retentively in the IM154-1/-2. During the warm
restart, the IM154-1/-2 goes into cyclic data exchange and the I/O are activated immediately.
If the configuration has changed since the last startup (for example, incorrect module
inserted or information about options is incorrect), the I/Os are disabled until the real
configuration once again matches the configured one.
8.1.1.5
Controlling and monitoring options
Introduction
You can use the control interface (PIQ) and feedback interface (PII) to control and monitor
options using the user program.
Recommendation: Before working with the ET 200pro optional expansions, use the feedback
interface to verify that all the required electronic modules are inserted (refer to the table
below). The contents of the feedback interface must match the specifications of the control
interface.
Note
The use of SFCs 14/15 enables consistent access to the control and feedback interface.
Principle
The control and feedback interface is located in the process input and output image of the
PM E-DC24V power module. It can only be accessed if entries ending in O for that power
module were selected in the configuration software.
One bit is available for each ET 200pro electronic module slot:
●
Control interface: Slots 2 to 17
●
Feedback interface: Slots 2 to 17
Figure 8-2
Control interface (PIQ) and feedback interface (PII)
