ALTUS Nexto Series User Manual

5. CONFIGURATION
Direct Repre-
sentation
Variable
Diagnostic Variable
T_DIAG_MODBUS
_RTU_SLAVE_1.*
Size Description
%QX(n+2).7
tCommand.
bDiag_23_reserved
BIT Reserved.
%QB(n+3)
byDiag_3_reserved
BYTE Reserved.
Communication Statistics:
%QW(n+4)
tStat.
wRXRequests
WORD
Counter of normal requests received by the
slave and answered normally. In case of
a broadcast command, this counter is in-
cremented, but it is not transmitted (0 to
65535).
%QW(n+6)
tStat.
wTXExceptionResponses
WORD
Counter of normal requests received by
the slave and answered with exception
code. In case of a broadcast command,
this counter is incremented, but it isn’t
transmitted (0 to 65535).
Exception codes:
1: the function code (FC) is legal, but not
supported.
2: relation not found in these MODBUS
data.
3: illegal value for this field.
128: the master/client hasn’t right for
writing or reading.
129: the MODBUS relation is disabled.
%QW(n+8)
tStat.
wRXFrames
WORD
Counter of frames received by the slave.
It’s considered a frame something which is
processed and it is followed by a Minimum
Interframe Silence, in other words, an ille-
gal message is also computed (0 to 65535).
%QW(n+10)
tStat.
wRXIllegalRequests
WORD
Illegal request counter. These are frames
which start with address 0 (broadcast)
or with the MODBUS slave address,
but aren’t legal requests – invalid syn-
tax, smaller frames, invalid CRC – (0 to
65535).
%QW(n+12)
tStat.
wRXOverrunErrors
WORD
Counter of frames with overrun errors dur-
ing reception – UART FIFO or RX line –
(0 to 65535).
%QW(n+14)
tStat.
wRXIncompleteFrames
WORD
Counter of frames with construction er-
rors, parity or failure during reception (0
to 65535).
%QW(n+16)
tStat.
wCTSTimeOutErrors
WORD
Counter of CTS time-out error, using the
RTS/CTS handshake, during the transmis-
sion (0 to 65535).
%QW(n+18)
tStat.
wDiag_18_Reserved
WORD Reserved.
Table 98: MODBUS RTU Slave Diagnostic
Note:
Counters: all MODBUS RTU Slave diagnostics counters return to zero when the limit value 65535 is exceeded.
122

ALTUS Nexto Series Specifications

General

Brand	ALTUS
Model	Nexto Series
Category	Computer Hardware
Language	English