Specifications

sigmadue - IEC 61131-3 Function Block Library
150
5-3-21 MB_SLV_RD_DWORD
FB Prototype MB_SLV_RD_DWORD
Input parameters
Output parameters
Description This Function Block reads a DWORD value from the memory area corresponding
to the passed register (
REGISTER ). The module returns the OPRS parameter
that is used to detect if the operation is performed correctly, and the value of the
register (
DATA ). The setting AD_MODE allows the user to select if the REGIS-
TER
input base is 0 ( AD_MODE = FALSE ) or 1 ( AD_MODE = TRUE). The default
value for
AD_MODE is TRUE.
Reference
tables
Here are reported the range of the parameters used by the function block.
Protocol
OPRS
Label Type Description
PROTOCOL ASCON_SERIALPROTOCOL Reference Protocol
REGISTER UINT Register
AD_MODE BOOL
Addressing Mode Setting
(default value = TRUE)
Label Type Description
OPRS USINT Function block result
DATA DWORD Data
PROTOCOL
REGISTER
AD_MODE
ASCON_SERIALPROTOCOL
UINT
BOOL
¡
¡
¡
USINT
BOOL
OPR
S
DATA
¡
¡
Protocol Description
SLAVE1 Protocol Modbus Slave 1
SLAVE2 Protocol Modbus Slave 2
OPRS Description
0 Service executed correctly
1 Address not allowed
3 Protocol number not valid