2.4 Communications with MP-series Controllers
Message Functions
2-89
O Register Writing Range HI (PARAM46 and PARAM47)
These parameters set the upper limit of the allowable address range for write requests from the remote sta-
tion. An error will occur if the write request is outside this allowable range.
Specify the writing range with word addresses.
Set the writing range so that it satisfies the following condition:
0 ≤ O register writing range LO ≤ O register writing range HI ≤ Maximum O register address
For System Use (PARAM48)
This parameter is used by the system. It contains the channel number of the communications buffer that is
currently in use.
Reserved for System (PARAM49 to PARAM51)
This parameter is used by the system.
Use the following settings to set the allowable writing range of O register addresses to
00100 to 27FFF:
PARAM44 = 0100 hex (lower word for 00100)
PARAM46 = 0000 hex (upper word for 00100)
PARAM45 = 7FFF hex (lower word for 17FFF)
PARAM47 = 0001 hex (upper word for 17FFF)
The MP3000 will return an error if a write request is received for an address outside the range from
OW00100 to OW17FFF, and will not perform the writing operation.
A user program must set PARAM48 to 0 on the first scan after startup. Thereafter, do not change the
value of PARAM48 from a user program or any other means. PARAM48 will be used by the system.
Do not change the values of PARAM49 to PARAM51 from a user program or any other means.
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