Slave object for Modbus TCP I/O.

• Modbus_Module

Description of slave

Link to datasheet for the specific slave type.

Status of the slave. Shows if tcp-link to slave is up or not.

Process that handles the card.

1: The slave is read by the plc process, and is handled by a specific
   thread in the plc, which is specified in the ThreadObject attribute.
2: The slave is read by the rt_io_comm process.
4: The slave is handled by an application program.

The PlcThread object of the plc thread that handles the slave.
The slave is read with the scantime of the thread.

IP-address for the remote node, or host name.
Dynamic change is not possible.

The default port for Modbus TCP is 502. If another port should be
used it is specifiec here.

Disables the slave.
When set to Disable no messages are sent. When Close is activated the
connection is also closed. Note that the value is set to Disable
after a Close is performed.

Specifies the action when the errorcounter has reached the error limit.

No                no action.
Reset inputs      the inputs for the slave are reset.
Emergency break   all I/O is stopped.

Network format is set to little endian.
The standard network format for Modbus TCP is big endian. Despite
this, slaves despite this uses little endian. Setting byte
ordering to little endian makes it possible to connect to such slaves.

ErrorCount will increase every cycle if status is not MB__NORMAL.
When ErrorCount reaches the ErrorLimit all inputs are reset to zero.

ErrorCount will increase every cycle if status is not MB__NORMAL.
When ErrorCount reaches the ErrorLimit all inputs are reset to zero.

If slave is disconnected ProviewR will try to reconnect.
Reconnect attempts are made with a exponential backoff starting at 1 s.
The time is doubled every attempt up to 64 secs and then continues to
try to reconnect at this cylicity.

If slave is disconnected ProviewR will try to reconnect to the slave.
Reconnect limit is no more in use, kept for possible future use.

The time in ms as a response from a read or write request is expected.
This is the maximum time we will wait for a response.

Maximum timeout. I no messages is received within this time the
connection to the slave is closed, and a new connection is opened.
The value should be greater than the TCP retransmit time.

Depending on the tcp stack used in the slave and also the size of its receive
buffer it may not be possible to send several requests at a time to a slave.
If the slave can only handle one request at a time this attribute should be set
to 'Yes'. The rule is all at once or one request at a time.

Received number of messages from slave.

Sent number of messages to slave.

Area where all input data is stored.

Area where all output data is stored.