Siemens SIMATIC TI505 Guide de l'utilisateur télécharger pdf (Page 7)

Simatic/TI 505 Ethernet Driver Help

For applications where the data can be divided into large blocks, using CAMP memory transfer will result in the

most efficient data transfer. Note that, in one CAMP read, up to 125 words could be returned which could include

2000 discrete points. Since CAMP memory transfer allows only one data type and only one memory range per

message, applications which read many small blocks or many different data types may benefit from using the

Packed Task Code format.

For example, reading 10 V memory values, 10 WY values, 30 WX values and 2 loop process variables would

require four messages (one for the V, one for the WY, one for the WX and one for the loop). Using the packed task

code format (which allows 14 NITP task code requests to be placed in a single message), allows data to be

obtained in a single message.

Optimum Performance Recommendations

All devices on a channel should be set to the same 505 Protocol mode. When possible, the project's data should

be divided into the following categories:

1. Items that are capable of utilizing Packed Task Code.

2. Items that are not capable of utilizing Packed Task Code. This includes the following:

l Arrays

l Strings

l Address types that are not supported with Packed Task Code. For example, DCP.

l Contiguous address ranges > 36 Words. For example, V1, V2, V3, ... V36, V37, V38.

All items in Category 1 should be placed into a device that is set to CAMP+Packed Task Code 505 Protocol mode on

a different channel from Category 2 items. It is recommended that the request size be set to 64 or 128.

All items in Category 2 should be placed into a device that is set to CAMP 505 Protocol mode on a different channel

from Category 1 items. It is recommended that the Request Size be set to 250.

Note: When reading a project file prior to addition of 505 Protocol option, the default value is set to CAMP.

Addressing Options

0/1-Based Bit Addressing

Memory types that allow bit within Word (such as V) can be referenced as a Boolean. The addressing notations

for doing this are as follows:

For each of these syntax, <bit> represents the bit number within the Word or DWord, depending on the memory

type. 0/1-Based bit addressing provides two ways of addressing a bit within the given Word or DWord; 0-Based

and 1-Based. 0-Based addressing means the first bit begins at 0. With 1-Based, the first bit begins at 1. The bit

order for the Word or DWord is irrelevant with this option. In other words, it doesn't matter whether the first bit

is the Most Significant Bit or the Least Significant Bit.

Note: In this driver, the first bit will either be bit 0 or bit 1 depending on this 0/1-Based bit addressing setting.

0-Based

This is the default setting.

Data Type Bit Range

Word Bits 0-15

DWord Bits 0-31

1-Based

Data Type Bit Range

Word Bits 1-16

DWord Bits 1-32

Note: 0/1-Based bit addressing does not apply to non-bit addresses such as Word addresses in V memory.

These addresses are always 1-Based and are not configurable.

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Siemens SIMATIC TI505 Guide de l'utilisateur Page 7

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