ALTUS Nexto Series User Manual

5. CONFIGURATION
Configuration Description Default Value Options
Diagnostic Variable Diagnostic variable name -
Name of a variable declared
in a program or GVL
Disabling Variable
Variable used to disable
MODBUS relation
-
Field for symbolic variable
used to disable, individually,
MODBUS requests config-
ured. This variable must be
of type BOOL. The variable
can be simple or array el-
ement and can be in struc-
tures.
Table 89: MODBUS Relations Configuration
Notes:
Setting: the number of factory default settings and the values for the column Options may vary according to the data type
and MODBUS function (FC).
Function Code: MODBUS (FC) functions available are the following:
Code
DEC HEX Description
1 0x01 Read Coils (FC 01)
2 0x02 Read Input Status (FC 02)
3 0x03 Read Holding Registers (FC 03)
4 0x04 Read Input Registers (FC 04)
5 0x05 Write Single Coil (FC 05)
6 0x06 Write Single Holding Register (FC 06)
15 0x0F Write Multiple Coils (FC 15)
16 0x10 Write Multiple Holding Registers (FC 16)
22 0x16 Mask Write Holding Register (FC 22)
23 0x17 Read/Write Multiple Holding Registers (FC 23)
Table 90: MODBUS Functions Supported by Nexto CPUs
Polling: this parameter indicates how often the communication set for this request must be performed. By the end of a
communication will be awaited a time equal to the value configured in the field polling and after that, a new communication
will be executed.
Read Data Start Address: field for the initial address of the MODBUS read data.
Read Data Size: the minimum value for the read data size is 1 and the maximum value depends on the MODBUS function
(FC) used as below:
Read Coils (FC 01): 2000
Read Input Status (FC 02): 2000
Read Holding Registers (FC 03): 125
Read Input Registers (FC 04): 125
Read/Write Multiple Registers (FC 23): 121
Read Data Range: this field shows the MODBUS read data range configured for each request. The initial address, along
with the read data size will result in the range of read data for each request.
Write Data Start Address: field for the initial address of the MODBUS write data.
Write Data Size: the minimum value for the write data size is 1 and the maximum value depends on the MODBUS
function (FC) used as below:
Write Single Coil (FC 05): 1
111

ALTUS Nexto Series Specifications

General

Brand	ALTUS
Model	Nexto Series
Category	Computer Hardware
Language	English