Details of the IODDTs Implicit Exchange Objects of Types T_COM_MB_BMX and T_COM_MB_BMX_CONF

At a Glance

The tables below show the implicit exchange objects of the IODDTs of types T_COM_MB_BMX and T_COM_MB_BMX_CONF_EXT that are applicable to Modbus serial communications. They differ in terms of configuration objects availability.

CH_ERROR bit

The following table shows the meaning of the error bit CH_ERROR (%Ir.m.c.ERR):

Standard symbol	Type	Access	Meaning	Address
CH_ERROR	EBOOL	R	Communication channel detected error bit	%Ir.m.c.ERR

Word object in Modbus Master Mode

The table below shows the meaning of the bit of the INPUT_SIGNALS word (%IWr.m.c.0):

Standard symbol	Type	Access	Meaning	Address
DCD	BOOL	R	Data carrier detect RS232 signal (only applicable to BMX NOM 0200 module)	%IWr.m.c.0.0
CTS	BOOL	R	Clear to send RS232 signal	%IWr.m.c.0.2
DSR	BOOL	R	Data set ready RS232 signal (only applicable to BMX NOM 0200 module)	%IWr.m.c.0.3

NOTE: %IWr.m.c.0.2 is at 1 when the voltage on CTS signal is positive. It is also applicable to DCD and DSR.

Word object in Modbus Slave Mode

The language objects are identical to those of the Modbus master function. Only the objects in the following table differ.

The table below shows the meaning of the bit of the INPUT_SIGNALS word (%IWr.m.c.0):

Standard symbol	Type	Access	Meaning	Address
LISTEN_ONLY	BOOL	R	Listen only mode	%IWr.m.c.0.8