Technical data

Configuring I/O areas for ZP
Fig. 10.1 illustrates the basic function of the cyclic I/Os. The field device
(slave) can only be addressed by the CP 5430 TF when it knows both the
L2 address and the corresponding service access point (SAP) of this field
device. Both the L2 address of the slave and the SAP number must be
specified using the ZP editor of the COM 5430 TF software package.
The CP 5430 TF becomes the "distributor" after it is configured with the ZP
editor. It performs the following functions:
➣ receives the trigger for data transmission via an HDB or CP internal
cycle
➣ reads the ZP output area of the CPU
➣ allocates the L2 address and destination SAP to the corresponding field
device
➣ "packs" all the output bytes belonging together in frames
➣ sends these frames to the addressed field devices and at the same
time requests reply frames from these field devices
CPU
CP 5430 TF
Field device
Peripherals
Output
area
Input
area
Input
buffer
Output
buffer
L2 bus
Dual-port RAM of the CP 5430 TF
SAP (with the CP 5430 TF, SAP 61 is used for ZP)
The SAP of the field device must be assigned with
COM 5430 TF
SAP 61
SAP ?
Fig. 10.1: Outline of the Functions of Cyclic I/Os
Communication with Cyclic I/Os B8976060/02
Volume 1 10 - 4