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CHAPTER 4

OPERATION

4-21

DT-203X, DT-105X and DT-110X display series

Example 1:

Display the message: «LOW LEVEL» in address display 4

Start

Address

high

Address

low

Code

Data

End

ASCII

E D

LOW LEVEL

* CR

Hexa

40h

30h

34h

45h

44h

4Ch 4Fh 57h 20h 4Ch 45h 56h

45h 4Ch

2Ah

0Dh

Example 2:

Display the message: « TIME: 09:50». 09:50 is the display time

Display address: 12

Start

Address

high

Address

low

Code

Data

End

ASCII

E D

TIME: 16h

* CR

Hexa

40h

31h

32h

45h

44h

54h 49h 4Dh 45h 3Ah 20h 16h

2Ah

0Dh

4.4.5. S7-200 protocol.

S7-200 protocol is the protocol designed to connect with Siemens PLS’s S7-200 series

using PPI port.

S7-200 protocol supports two kinds of messages. Messages with and without variables.

With this protocol the display may control as many as 6 messages without variables and 4

messages with variables together. All messages are shown sequentially.

To know what the messages should be shown, the display reads a table of 18 VW’s

from the PLC memory. The first VW number must be configured into the parameter VW. This

parameter is specific to this protocol.

The slave number is also a specific parameter for this protocol. It is used to code the

PLC address into the PPI network. By default S7-200 is assigned to address 2.

The next table shows the meaning of each VW

VW Number

VW n

Number of message without variables 1

VW n + 2

Number of message without variables 2

VW n + 4

Number of message without variables 3

VW n + 6

Number of message without variables 4

VW n + 8

Number of message without variables 5

VW n + 10

Number of message without variables 6

VW n + 12

Number of message with variables 1

VW n + 14

Number of message with variables 2

VW n + 16

Number of message with variables 3

VW n + 18

Number of message with variables 4

VW n + 20

Number of VW where variable 1 is located

VW n + 22

Total number of VW's of variable 1

VW n + 24

Number of VW where variable 2 is located

VW n + 26

Total number of VW's of variable 2

VW n + 28

Number of VW where variable 3 is located

VW n + 30

Total number of VW's of variable 3

VW n + 32

Number of VW where variable 4 is located

VW n + 34

Total number of VW's of variable 4

1 2 ... 29 30 31 32 33 34 35 36 37 38 39

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