Siemens SINEC L2 User Manual

S5-95U, SINEC L2 Data Transmission Using Cyclic I/O
7 Data Transmission Using Cyclic I/O
This chapter provides you with the following information:
• How this type of data transmission functions in principle
• How to set parameters for the programmable controllers
• How to program with STEP 5 for this type of data transmission (examples)
7.1 Features of Cyclic I/O
• Data transmission with cyclic I/O (ZP) is appropriate for the frequent transmission of small
amounts of data between active S5-95Us and passive S5-95Us or field devices. Extensive
programming is not required.
• A ZP station that scans other ZP stations is called a ZP master. A ZP master is always an
active station on the SINEC L2 network.
A ZP station that is scanned by a ZP master is called a ZP slave. A ZP slave is generally a
passive station on the SINEC L2 network. Exception: a ZP slave S5-95U can be either an
active or a passive station on the SINEC L2 network.
The following devices can be ZP masters:
- an active S5-95U
- a CP 5430
The following devices can be ZP slaves:
- an active S5-95U
- a passive S5-95U
- a field device
Settings in DB1 determine master/slave status of an S5-95U.
• Each ZP master can service a maximum of 32 ZP slaves. Several ZP masters can request
data in parallel from a ZP slave.
• A reserved data block (ZP DB) is responsible in the S5-95U for the word-by-word data
exchange. The cyclic I/O input area (ZPE) and cyclic I/O output area (ZPA) for the respective
stations are defined in data block ZP DB.
In the ZP master, the ZPE and the ZPA can each accept a maximum of 128 data words. In the
ZP slave, the ZPE and the ZPA can each accept a maximum of 121 data words.
The input data and output data are available without requiring a request to transmit or a request
to receive in the control program.
You set the parameters for the ZP DB and for the ZP areas in DB1.
• Status bytes (STBs) are available to control the cyclic I/O. ou set the parameters for the
location of the STBs in DB1.
EWA 4NEB 812 6112-02 7-1

Siemens SINEC L2 Specifications

General

Power Supply	24 V DC
Operating Temperature	-40 to +70 °C
Product Family	SINEC
Protection Class	IP30
Product Type	Switch
Dimensions	Varies depending on the specific model
Network Standards	IEEE 802.3, IEEE 802.1Q, IEEE 802.1p

Summary

1 System Description

1.2 The SINEC L2 Local Area Network

1.3 Procedure for Accessing the SINEC L2 Network

1.4 Assigning Parameters for the L2 Interface of the S5-95U

Details parameter assignment in DB1 for the L2 interface, including basic parameters and data transmission parameters.

2 Installation Guidelines

2.1 Basic Configuration

Illustrates main components of SINEC L2 in RS 485 and S5-95U installation technology.

2.2 Installing a SINEC L2 Bus Segment

Explains how to install a SINEC L2 bus segment, including mounting the bus cable on the connector.

2.3 Linking Bus Segments with the L2 Repeater

3 Start-Up, Tests, and Diagnostics

3.2 START-UP Sequence

Details the sequence of operations during startup, including power recovery and cold restart routines.

3.3 Starting Up a System

Provides safety suggestions, minimum hardware requirements, and startup diagnostics procedures.

3.4 FMA Services

4 Data Transmission Using a Standard Connection

4.2 Assigning Parameters in DB1 of the S5-95U for Data Exchange with Standard Connections

Details parameter assignment in DB1 for standard connections, including mailbox and coordination byte locations.

4.5 Programming Example for Data Transmission via a Standard Connection

5 Integral Standard Function Blocks L2-SEND and L2-RECEIVE

5.1 Parameters for L2-SEND and L2-RECEIVE

Lists and explains parameters for L2-SEND/L2-RECEIVE, including job number allocation and data source/destination.

5.2 Direct and Indirect Parameter Settings for the L2 Function Blocks

6 Data Transmission Using PLC-to-PLC Connections

6.2 Assigning Parameters in DB1 of the S5-95U for Data Exchange with PLC-to-PLC Connections

Details parameter assignment in DB1 for PLC-to-PLC connections, including station identification and status byte locations.

6.3 Programming Example for Data Transmission via PLC-to-PLC Connections Using Standard Function Blocks

7 Data Transmission Using Cyclic I/O

7.2 Assigning Parameters in DB1 of the S5-95U for Data Exchange with Cyclic I/O

Covers parameter assignment in DB1 for cyclic I/O, including ZP areas, status bytes, and ZP master/slave connection.

7.4 Programming Example for Data Transmission via Cyclic I/O

8 Data Transmission by Accessing Layer 2 Services

8.3 Assigning the S5-95U Parameters for Data Communications

Details parameter assignment in DB1 for layer 2 accesses, including status byte locations and job number definitions.

8.4 FBs for Managing All Layer 2 Services

9 Programmer Functions Over the SINEC L2 Network

9.2 Selecting the L2 Interface

Guides on selecting the SINEC L2 interface using the programmer's 'INTERFACE SELECTION' function.

9.3 Entering Defaults

9.4 Editing a Path

Details how to edit a path to reach a station on the SINEC L2 LAN using the 'BUS DIALLING' utility.

9.5 Setting the L2 Basic Parameters on the Programmer

Describes how to set L2 basic parameters on the programmer via the 'SYSID CP L2 (LOCAL)' screen.

9.6 Activating an Edited Path