Address worksheet, Specific bits to bit data types, Character arrays to ascii data types – Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL User Manual
Page 83
4–35
Planning an Application
Publication 2706-817
Before entering tags in the Tag Editor dialog, use a copy of the
Address Worksheet in Appendix H to record them. Each line in the
worksheet is 1 word (2 bytes or 16 bits), since this is the unit of
controller address memory. Use separate worksheets for display
(logic controller write) and for entry (logic controller read) variables,
since these are stored in different memory areas.
The figure shows two examples of recording addresses. For proper
address formats, refer to the controller’s user manual. Assign:
•
a whole word (16 bits) to signed and unsigned integers and 4BCD
data types
•
specific bits to bit data types
•
a word (or words adjacent to one another) for bit triggers
•
character arrays to ASCII data types.
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1
0
Entry Address Worksheet
Controller Address
Word Address
Tag Name
I:020
O:027
O:028
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16
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10
7
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5
4
3
2
1
0
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1
0
Word Address
Tag Name
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7
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1
0
Octal
Decimal
Octal
Decimal
RTRN_MSG_NO
HANDSH
Read Tag Name = MOTOR_DISPLAY
Write Tag Name = MOTOR_ENTRY
Handshake Tag Name = HANDSH
Notification Tag Name = RTRN_MSG_NO
READ
WRITE
MOTOR_DISPLAY
Display Address Worksheet
MOTOR_ENTRY
I:021
Address Worksheet