Details of IODDT Explicit Exchange Objects of Type T_COM_CHAR

At a Glance

This part presents the explicit exchange objects of the IODDT of the T_COM_CHAR_BMX type that are applicable to Character Mode communication. It includes the word type objects whose bits have a specific meaning. These objects are described in detail below.

In this part, the IODDT_VAR1 variable is of the T_COM_STS_GEN type.

Observations

In general, the meaning of the bits is given for bit status 1. In specific cases, each bit status is explained.

Not all bits are used.

Explicit Exchange Execution Flag: EXCH_STS

The following table shows the meanings of the exchange control bits of the EXCH_STS channel (%MWr.m.c.0) :

Standard symbol	Type	Access	Meaning	Address
STS_IN_PROGR	BOOL	R	Read channel status words in progress.	%MWr.m.c.0.0
CMD_IN_PROGR	BOOL	R	Command parameter exchange in progress.	%MWr.m.c.0.1
ADJ_IN_PROGR	BOOL	R	Adjustment parameter exchange in progress (not applicable to BMX NOM 0200 module).	%MWr.m.c.0.2

Explicit Exchange Report: EXCH_RPT

The table below presents the meaning of the EXCH_RPT exchange report bits (%MWr.m.c.1):

Standard symbol	Type	Access	Meaning	Address
STS_ERR	BOOL	R	Detected read error for channel status words.	%MWr.m.c.1.0
CMD_ERR	BOOL	R	Anomaly during command parameter exchange.	%MWr.m.c.1.1
ADJ_ERR	BOOL	R	Anomaly while exchanging adjustment parameters (not applicable to the BMX NOM 0200 module).	%MWr.m.c.1.2

Standard Channel Detected Faults, CH_FLT

The following table explains the various meanings of the CH_FLT status word bits (%MWr.m.c.2) :

Standard symbol	Type	Access	Meaning	Address
NO_DEVICE	BOOL	R	No device is working on the channel.	%MWr.m.c.2.0
ONE_DEVICE_FLT	BOOL	R	A device on the channel is inoperating.	%MWr.m.c.2.1
BLK	BOOL	R	Terminal block is not connected.	%MWr.m.c.2.2
TO_ERR	BOOL	R	Time out overtaken (analysis needed).	%MWr.m.c.2.3
INTERNAL_FLT	BOOL	R	Internal detected error or channel self-testing.	%MWr.m.c.2.4
CONF_FLT	BOOL	R	Different hardware and software configurations.	%MWr.m.c.2.5
COM_FLT	BOOL	R	Communication analysis is needed with the PLC.	%MWr.m.c.2.6
APPLI_FLT	BOOL	R	Application detected error (adjustment or configuration error).	%MWr.m.c.2.7

Reading is performed by the READ_STS instruction (IODDT_VAR1).

Specific Channel Status, %MWr.m.c.3

The table below shows the various meanings of the bits of the PROTOCOL (%MWr.m.c.3) channel status word:

Standard symbol	Type	Access	Meaning	Address
PROTOCOL	INT	R	Byte 0 = 16#03 for Character Mode function.	%MWr.m.c.3

Reading is performed by the READ_STS (IODDT_VAR1) instruction.

%MWr.m.c.24 Channel Command

The table below shows the various meanings of the bits of the CONTROL (%MWr.m.c.24) word:

Standard symbol	Type	Access	Meaning	Address
DTR_ON	BOOL	R/W	Set the Data Terminal Ready signal.	%MWr.m.c.24.8
DTR_OFF	BOOL	R/W	Reset the Data Terminal Ready signal.	%MWr.m.c.24.9

The command is carried out with the WRITE_CMD (IODDT_VAR1) instruction.

For further information about how to change protocols, you can refer to protocol changes.

%QWr.m.c.0 Word Object

The table below shows the meaning of the bit 0 of %QWr.m.c.0 word:

Standard symbol	Type	Access	Meaning	Address
STOP_EXCH	BOOL	R/W	Stop all exchanges on rising edge (available on the BMX NOM 0200 module only).	%QWr.m.c.0.0