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7-11
7 Using Modbus-RTU Slave Mode
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
7-2 De
vic
e V
ariab
les f
o
r CJ-series Un
it an
d S
ystem-defi
n
ed
V
ariables (Mo
d
b
u
s-R
T
U Sla
ve Mo
de)
7
7-2
-4 De
vice V
a
riab
le f
o
r CJ-ser
ies Unit
*1 The current settings for the port are read. For details on the read contents, refer to 7-2-1 Device Variable for
CJ-series Unit for System Settings. If a System Setup error occurs, the default settings will be read.
*2 The status of this bit is not fixed in the Modbus-RTU Slave Mode.
*3 Always FALSE in the Modbus-RTU Slave Mode.
*4 In the Modbus-RTU Slave Mode, this bit is changed to TRUE if a CRC check error has occurred.
z
Error Log EEPROM Error
This bit will be set to TRUE if an error occurs in reading or writing the error log stored in EEPROM on
the assumption that the EEPROM has reached its useful life. At the same time, the ERC indicator
will also light.
*_P1_TransErrSta *_P2_TransErrSta WORD R Transmis-
sion Error
Status Bit 15: Transmission error
Bit 07: FCS check error
Bit 04: Overrun error
Bit 03: Framing error
Bit 02: Parity error
*_P1_TransErr *_P2_TransErr BOOL R Transmis-
sion Error TRUE: Transmission error
FALSE: No transmission error
*_P1_FCSErr *_P2_FCSErr BOOL R FCS Check
Error (*4) TRUE: FCS check error
FALSE: FCS check normal
*_P1_OverRunErr *_P2_OverRunErr BOOL R Overrun
Error TRUE: Overrun error
FALSE: Normal
*_P1_FramingErr *_P2_FramingErr BOOL R Framing
Error TRUE: Framing error
FALSE: Normal
*_P1_ParityErr *_P2_ParityErr BOOL R Parity Error TRUE: Parity error
FALSE: Normal
*_P1_MbsCmdRxCntS
ta *_P2_MbsCmdRxCntS
ta UINT R Number of
Normally
Received
Commands The number of normal Modbus-
RTU commands received from the
communications port is stored.
*_P1_MbsRespTxCntS
ta *_P2_MbsRespTxCntS
ta UINT R Number of
Normally
Sent
Responses The number of normal Modbus-
RTU responses sent to the com-
munications port is stored.
*_P1_MbsTxErrCnt *_P2_MbsTxErrCnt UINT R Number of
Overrun
Errors,
Framing
Errors, and
Parity Errors
(Transmis-
sion Errors) The number of overrun errors,
framing errors, and parity errors
that occurred is stored.
*_P1_MbsCRCErrCnt *_P2_MbsCRCErrCnt UINT R Number of
CRC Errors
(Transmis-
sion Errors) The number of CRC errors that
occurred is stored.
*_P1_MbsCmdErrCnt *_P2_MbsCmdErrCnt UINT R Number of
Command
Format
Errors (Ille-
gal Function
Codes and
Illegal
Addresses)
The number of illegal function
codes and illegal addresses/data in
received Modbus-RTU commands
is stored.
Device variable for CJ-series Unit
Type R/W Name Function
Port 1 Port 2