Specifications
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
@
0
4
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
@
1
2
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