RKC INSTRUMENT SA100L, Communication Instruction Manual

Page: 49 / 64

6. MODBUS COMMUNICATION PROTOCOL
IMR01J08-E1 43
Continued from the previous page.
(Attribute RO: Read only, R/W: Read and Write)
Resister
address
Name
Hexa-
decimal Decimal
Attrib-
ute
Data range
Factory set
value
Set data lock 0016 22 R/W Bit data
b0: Lock only setting items other than
SV and alarms
(Data 0: Unlock, 1: Lock)
b1: Lock only alarms
(Data 0: Unlock, 1: Lock)
b2: Lock only SV
(Data 0: Unlock, 1: Lock)
b3: Engineering mode
(Data 0: Lock, 1: Unlock)
b4, b5: Unused (“0” fixed)
[Decimal number: 0 to 15]
0
EEPROM storage
mode
1
0017 23
R/W 0: Backup mode
(Set values are store to the EEPROM)
1: Buffer mode
(No set values are store to the EEPROM)
0
EEPROM storage
status
2
0018 24
RO 0: Mismatch
1: Match
-----
Unused 0019
⋅
⋅
⋅
002F
25
⋅
⋅
⋅
47
----- ----- -----
1
The non-volatile memory (EEPROM) has limitations on the number of memory rewrite times. If the
buffer mode is selected as an EEPROM storage mode, all of the set values changed are not written to
the EEPROM and thus a problem of limitations on the number of memory rewrite times can be
solved. When the memory is used to frequently change the set value via communication, select the
buffer mode.
When selecting any EEPROM storage mode, take notice of the following.
•
If power failure occurs while the buffer mode is selected, the set value returns to the value before
the storage mode is selected.
•
If the buffer mode is changed to the backup mode, all of the set values at that time are stored to
the EEPROM. If necessary to backup the final value of each set item, select the backup mode.
•
When the power is turned on, the backup mode is always set.
2
The contents of the buffer memory and those of the EEPROM can be checked.
When data is 0 : The contents of the buffer memory do not match with those of the EEPROM.
•
As data is being written to the EEPROM in backup mode, do not turn the power
off. If turned off, no set values are stored.
•
If the set value is changed after the backup mode is changed to the buffer mode, 0
is set (mismatch). As the set value changed is not backup, select the backup mode
if necessary.
When data is 1 : The contents of the buffer memory match with those of the EEPROM.
(Data write to the EEPROM is completed.)