Siemens CP 1243-8 IRC, Руководство по эксплуатации

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Configuration and operation
4.7 Configuration in STEP 7 Basic
CP 1243-8 IRC
72
Operating Instructions, 06/2015, C79000-G8976-C385-01
Type of tranmsission / Event classes
For the CP the following transmission types are available:
● Transfer after call
The current value of the data point is entered in the image memory of the CP.
● Every value triggered
Each value change is entered in the send buffer in chronological order.
● Current value triggered
Only the current value is entered in the send buffer.
See section Process image, type of transmission, event classes (Page 72) for information on
this.
Priority in the scan cycle
Prioritizes the reading or writing of the data point value in the scan cycle of the CPU. The
option "High priority" means that the data point is read in each scan cycle. The option "Low
priority" means that the data point is not necessarily read in each scan cycle.
See section CPU scan cycle (Page 74) for information on this.
Object number
The object number must be unique and the maximum permitted number of data points per
SINAUT object must not be exceeded. Refer to the column “Number of data points per
SINAUT object” in the section Datapoint types (Page 70).
Object channel
The object channel is the channel of the corresponding SINAUT object.
Partner object number
Per object number, you need to specify a unique object number of the communications
partner.
This must result in unique pairs of "Object number" and "Partner object number".
4.7.12 Process image, type of transmission, event classes
The image memory (process image of the CP)
The image memory is the process image of the CP. All the current values of the configured
data points are stored in the image memory. New values of a data point overwrite the last
stored value in the image memory.
The values are sent only after querying by the communications partner (see below “Transfer
after call“) or along with a message from the send buffer that needs to be transferred
immediately.