2.7 Communications with a Mitsubishi PLC (QnA-compatible 3E Frame Protocol)
Message Functions
2-170
Local Station Register Type (PARAM22)
Set the register type of the read data destination or write data source in the MP3000.
The register types that can be used depend on whether you are reading or writing.
The following table lists the combinations of register types.
Reserved for System (PARAM23)
This parameter is used by the system.
For System Use (PARAM24)
This parameter is used by the system. It contains the channel number of the communications buffer that is
currently in use.
Reserved for System (PARAM25 to PARAM28)
This parameter is used by the system.
Register Type
Value
Type Remarks
0 M Sets the target data type to MB for bits and MW for words.
1 G Sets the target data type to GB for bits and GW for words.
2 I Sets the target data type to IB for bits and IW for words.
3 O Sets the target data type to OB for bits and OW for words.
4 S Sets the target data type to SB for bits and SW for words.
5 or higher
−
These setting are not used for the QnA-compatible 3E Frame protocol.
Function Code Applicable Register Types
01, 02, 03, 04, 09, or 0A hex M, G, or O
05, 06, 0B, 0F, or 10 hex M, G, I, O, or S
0D hex M
0E hex M
Do not change the value of PARAM23 from a user program or by any other means.
A user program must set PARAM24 to 0 on the first scan after startup. Thereafter, do not change the
value of PARAM24 from a user program or by any other means. PARAM24 will be used by the sys-
tem.
Do not change the values of PARAM25 to PARAM28 from a user program or by any other means.
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