5 Message Communications
5 - 4
CompoNet Communications Unit User’s Manual (I582-E1)
D: First Word Address of Response Storage Area
Set the first word address of the area to store the response to the Explicit Message.
Precautions for Correct Use
Precautions for Correct Use
• When the CMND instruction issues an Explicit Message, due to the following reason, the
attachment data to the Explicit Message is sent in reverse order of high and low bytes.
Data on communications lines: Sent in order of low byte (L) to high byte (H).
Data processed in PLC: Sent in order of high byte (H) to low byte (L).
The attachment data in a response will also be sent in this order.
Note this when sending or receiving a single-word (16-bit) or double-word (32-bit) data.
Most inverter parameters take single-word data, except for the frequency reference, output
frequency, and other parameters that take single-word data.
Example)
In an Explicit Message communications, single-word data 1234 hex will be sent in
order of 34 hex to 12 hex on a communications line.
On the other hand, double-word data 12345678 hex will be sent in order of 78 hex,
56 hex, 34 hex, and 12 hex.
Therefore, in the CMND instruction, set the data in operand S+4 and onwards as
follows.
34
12
Service Data
78
56
34
12
Service Data
Command Format
Example: 1234 hex
Example: 12345678 hex
S+4
34
12
15
08 07
00
bit
S+4
12
34
15
08 07
00
bit
S+4
56
12
78
34
15
08 07
00
bit
S+4
78
34
56
12
15
08 07
00
bit
Example: 1234 hex
Example: 12345678 hex
When setting from high byte
When setting from high byte
When setting from low byte
When setting from low byte
Содержание 3G3AX-MX2-CRT-E
Страница 58: ...2 CompoNet Communications Unit Mounting and Wiring 2 16 CompoNet Communications Unit User s Manual I582 E1...
Страница 94: ...3 Network Startup 3 36 CompoNet Communications Unit User s Manual I582 E1...
Страница 118: ...4 Remote I O 4 24 CompoNet Communications Unit User s Manual I582 E1...
Страница 134: ...5 Message Communications 5 16 CompoNet Communications Unit User s Manual I582 E1...
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