Assigning Parameters In Db1 Of The S5-95U For Data Exchange With Cyclic I/O - Siemens SIMATIC S5 Manual

Data Transmission Using Cyclic I/O
Communication with the CP 5430 Communications Processor
The CP 5430 communications processor is required when S5-95U programmable controllers
communicate via cyclic I/O (ZP) with the SIMATIC S5-115U to S5-155U controllers. The CP 5430
functions as the ZP master. The S5-95U functions as the ZP slave. Section 7.2 describes how to
set the parameters for the S5-95U.
You must enter the input/output areas and the SAP 61 as the destination into the ZP editor
screen of COM CP 5430.
Refer to the SINEC L2 CP 5430 Operating Guide for additional information about the CP 5430.
7.2 Assigning Parameters in DB1 of the S5-95U for Data Exchange with
Cyclic I/O
DB1 does not have default settings for ZP. Assign the following parameters:
• The ZP output area ZPA where the transmit data are located
• The ZP input area ZPE where the receive data are located
• The location of the status bytes
You must assign parameters in DB1 for the location of one status byte (STB). All status bytes must
be in the flag area. The status byte indicates the status of the cyclic I/O and possible errors.
You can assign parameters in DB1 of the ZP master for a status byte that will allow you to get the
ZP slave life list. Section 7.3 describes the structure of the status bytes and explains the ZP slave
life list.
You set parameters for a ZP data block (ZP DB) in DB1. Figure 7-2 illustrates how DB1, the STBs ,
and ZP DB work together in a ZP master.
DB1
SL2:
...
ZPDB DB100
ZPMS MB100
ZPLI MB101
...
Figure 7-2. Diagram: Data Transmission Using Cyclic I/O
Both the entire ZP input area and the entire ZP output area of an S5-95U must be in one area
without gaps in the ZP data block. The same ZPA or even data words from the ZPA of a ZP master
can be specified for different ZP slaves.
Figures 7-3 and 7-4 illustrate this requirement with an example for a ZP master and an example for
a ZP slave.
7-4
Status byte for ZP master MB100
Status byte for ZP slave life list MB101
Length byte MB102
S5-95U, SINEC L2
DB100
ZPE
.
.
ZPA
.
DB202
ZP slave life
list
EWA 4NEB 812 6112-02