Technical data

9 Data Transmission with Global I/Os
This chapter explains the following:
➣ The applications for which data transmission with global I/Os is suitable.
➣ How this type of data transmission functions.
➣ How to assign parameters for the CP 5430 TF/CP 5431 FMS for this
type of transmission when programmable controllers exchange data via
the global I/Os (GP).
➣ How to use this type of data transmission based on an example
including a STEP 5 program (example in Section 9.3).
Areas of application:
Communication with global I/Os is only allowed via the base interface
number base SSNR!
Data transmission with global I/Os (I/O interface) is suitable for
communication between SIMATIC PLCs.
Data transmission with global I/Os is suitable for the transmission of single
bytes using high priority broadcast frames between active SIMATIC S5
programmable controllers. Data with the following characteristics may be
considered for this type of communication.
➣ Small volumes of data
➣ Time-critical data
➣ Data which does not change constantly
This, for example, might include control commands, messages, measured
values and analog values.
B8976060/02 Communication with Global I/Os
9 - 1 Volume 1