Details of the Explicit Exchange Objects of the T_COM_UTW

At a Glance

This part presents the explicit exchange objects of the IODDT of the T_COM_UTW_M type which apply to Uni-Telway slave communication with PCMCIA cards. It includes the word type objects whose bits have a specific meaning. These objects are described in detail below.

Sample Variable Declaration: IODDT_VAR1 of type T_COM_UTW_S

Observations

In general, the meaning of the bits is given for bit status 1. In specific cases an explanation is given for each status of the bit.
Not all bits are used.

Execution Flags of an Explicit Exchange: EXCH_STS

The table below shows the meaning of channel exchange control bits from channel EXCH_STS (%MWr.m.c.0).

Standard Symbol	Type	Access	Meaning	Address
STS_IN_PROGR	BOOL	R	Reading of channel status words in progress	%MWr.m.c.0.0
CMD_IN_PROGR	BOOL	R	Current parameter exchange in progress	%MWr.m.c.0.1
ADJ_IN_PROGR	BOOL	R	Adjustment parameter exchange in progress	%MWr.m.c.0.2

Explicit Exchange Report: EXCH_RPT

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

Standard Symbol	Type	Access	Meaning	Address
STS_ERR	BOOL	R	Reading error for channel status words	%MWr.m.c.1.0
CMD_ERR	BOOL	R	Error during command parameter exchange	%MWr.m.c.1.1
ADJ_ERR	BOOL	R	Error during adjustment parameter exchange	%MWr.m.c.1.2

Standard Channel Faults, CH_FLT

The table below shows the meaning of the bits of the status word CH_FLT (%MWr.m.c.2). Reading is carried out by a READ_STS (IODDT_VAR1).

Standard Symbol	Type	Access	Meaning	Address
NO_DEVICE	BOOL	R	No device is working on the channel.	%MWr.m.c.2.0
1_DEVICE_FLT	BOOL	R	A device on the channel is faulty.	%MWr.m.c.2.1
BLK	BOOL	R	Terminal block fault (not connected)	%MWr.m.c.2.2
TO_ERR	BOOL	R	Time out error (defective wiring)	%MWr.m.c.2.3
INTERNAL_FLT	BOOL	R	Internal 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	Problem communicating with the PLC	%MWr.m.c.2.6
APPLI_FLT	BOOL	R	Application error (adjustment or configuration error)	%MWr.m.c.2.7

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

The table below shows the meanings of the PROTOCOL (%MWr.m.c.3) channel status word. Reading can be done via a READ_STS (IODDT_VAR1).

Standard Symbol	Type	Access	Meaning	Address
PROTOCOL	INT	R	Byte 0 = 16#01 for the slave Uni-Telway function	%MWr.m.c.3

Command

The table below shows the meaning of the bits of the CONTROL word (%MWr.m.c.15). The command is made by a WRITE_CMD, e.g.: WRITE_CMD (IODDT_VAR1).

Standard Symbol	Type	Access	Meaning	Address
DTR_ON	BOOL	R/W	DTR signal (Data Terminal Ready) ON	%MWr.m.c.15.8
DTR_OFF	BOOL	R/W	DTR signal (Data Terminal Ready) OFF	%MWr.m.c.15.9
UTW_TO_CHAR	BOOL	R/W	Change from Uni-Telway to character mode (modem)	%MWr.m.c.15.14
CHAR_TO_UTW	BOOL	R/W	Change from Character Mode (modem) to Uni-Telway	%MWr.m.c.15.15