ALTUS Nexto Series User Manual

5. CONFIGURATION
Configuration Description Default Possibilities
Minimum Interframe
(chars)
Minimum silence time be-
tween different frames
3.5 3.5 to 100.0
Keep the communication
running on CPU stop
Enable the MODBUS Sym-
bol Slave to run while the
CPU is in STOP or after a
breakpoint
Unchecked Checked or unchecked
Table 97: Modbus Slave Advanced Configurations
Notes:
Task Cycle: the user will have to be careful when changing this parameter as it interferes directly in the answer time, data
volume for scan and mainly in the CPU resources balance between communications and other tasks.
Send Delay: the answer to a MODBUS protocol may cause problems in certain moments, as in the RS-485 interface or
other half-duplex. Sometimes there’s a delay between the slave answer time and the physical line silence (slave delay to put
RTS in zero and put the RS-485 in high impedance state). To solve this problem, the master can wait the determined time in
this field before sending the new request. On the opposite case, the first bytes transmitted by the master could be lost.
Minimum Interframe: the MODBUS standard defines this time as 3.5 characters, but this parameter is configurable in
order to attend the devices which don’t follow the standard.
The MODBUS Slave protocol diagnostics and commands configured, either by symbolic mapping or direct representation,
are stored in T_DIAG_MODBUS_RTU_SLAVE_1 variables. For the direct representation mapping, they are also in 4 bytes and
8 words which are described in table below (where “n” is the configured value in the %Q Start Address of Diagnostics Area):
Direct Repre-
sentation
Variable
Diagnostic Variable
T_DIAG_MODBUS
_RTU_SLAVE_1.*
Size Description
Diagnostic Bits:
%QX(n).0
tDiag.
bRunning
BIT The slave is in execution mode.
%QX(n).1
tDiag.
bNotRunning
BIT
The slave is not in execution (see bit: bIn-
terruptedByCommand).
%QX(n).2
tDiag.
bInterruptedByCommand
BIT
The bit bNotRunning was enabled as the
slave was interrupted by the user through
command bits.
%QX(n).3
tDiag.
bConfigFailure
BIT Discontinued diagnosis.
%QX(n).4
tDiag.
bRXFailure
BIT Discontinued diagnosis.
%QX(n).5
tDiag.
bTXFailure
BIT Discontinued diagnosis.
%QX(n).6
tDiag.
bModuleFailure
BIT Discontinued diagnosis.
%QX(n).7
tDiag.
bDiag_7_reserved
BIT Reserved.
Error codes:
120

ALTUS Nexto Series Specifications

General

Brand	ALTUS
Model	Nexto Series
Category	Computer Hardware
Language	English