Siemens SIMATIC NET S7-1200 User Manual

Configuration and operation
5.7 Types of transmission, event classes, triggers
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
41
Event classes for the IEC protocol
The process data of the various event classes is handled as follows:
●
Every value triggered
Each value change is entered in the send buffer in chronological order.
●
Current value triggered
Only the current value at the time the trigger condition was met is entered in the image
memory and overwrites the last value stored there.
Trigger
Trigger types
Various trigger types are available for event-driven transfer:
●
Threshold value trigger
The value of the data point is transferred when this reaches a certain threshold. The
threshold is calculated as the difference compared with the last stored value, refer to the
section Threshold value trigger (Page 54).
●
Time trigger
The value of the data point is transferred at configurable intervals or at a specific time of
day.
●
Event trigger
The value of the data point is transferred when a configurable trigger signal is fired. For
the trigger signal, the edge change (0 → 1) of a trigger bit is evaluated that is set by the
user program. When necessary, a separate trigger bit can be configured for each data
point.
Resetting the trigger bit
If the memory area of the trigger bit is in the bit memory or in a data block, the trigger bit is
reset to zero when the data point is transferred.
Generation of events if a data point status changes
The status IDs of the data points described in the section Communications services (Page 9)
also cause event-driven transfer.
With data points that were configured as an event, a change in a status bit causes an event
to be generated and therefore results in unsolicited transfer.
Example: If the status "RESTART" or "NT" of a data point configured as an event changes to
"Value updated" when the station starts up, this causes the transfer of the value.

Siemens SIMATIC NET S7-1200 Specifications

General

Supply voltage	24 V DC
Protection class	IP20
Product type designation	S7-1200
Transfer rate	10/100 Mbit/s
Number of ports	4
Power consumption	2.5 W
Operating temperature	0 °C to 60 °C
Mounting type	DIN rail
Switching capacity	1 Gbps

Summary

Application and properties

Communications services

Details supported communication services like DNP3 and IEC 60870-5 protocols.

Other services and properties

Configuration examples

Requirements for use

Hardware requirements

Lists required hardware and firmware versions for DNP3 and IEC setups.

Software requirements

Specifies necessary configuration and online function software, like STEP 7 versions.

LEDs and connectors

LEDs

Details the function and meaning of various LEDs on the module.

Electrical connections

Describes power supply and Ethernet interface connections.

Installation, connecting up, commissioning

Important notes on using the device

Notices on use in hazardous areas

Provides specific warnings for explosion hazards and hazardous environments.

Notices regarding use in hazardous areas according to ATEX

Details ATEX requirements for enclosures and operational conditions.

Notices regarding use in hazardous areas according to UL HazLoc

Outlines UL HazLoc suitability and warnings for hazardous locations.

Installation

Installing, connecting up and commissioning

Configuration and operation

Addressing and network configuration

Covers required information for master addressing and VPN connections.

Configuration in STEP 7

Details configuring modules, networks, redundant systems, and steps in STEP 7.

Configuring datapoints and messages (e-mails)

Explains configuring user data, PLC tags, and sending e-mail notifications.

Datapoint types

Lists supported data point types for DNP3 and IEC protocols with S7 data types.

Types of transmission, event classes, triggers

Covers data storage, transmission types, event classification, and triggers.

Notes on configuring individual functions

Provides detailed configuration notes for communication, SNMP, and Ethernet interface options.

Diagnostics and upkeep

Diagnostics options

Outlines available diagnostics methods like LEDs, STEP 7 tabs, and online functions.

Downloading firmware

Explains how to find and download new firmware versions for the CP.

Module replacement