User manual

IEC61131 User and Reference Manual
April 22, 2008
504
 The Accept Class 3 selection displays the enable/disable status of unsolicited responses from the
slave device for Class 1 events. The default selection is disabled.
The Save IIN Flags checkbox enables storing the IIN (Internal Indications) flags from the slave
station in a Modbus database register. When this parameter is checked the IIN flags are saved to the
entered Modbus register address. Valid entries are Modbus register addresses 30001 to 39999 and
40001 to 49999. The default value is 0.
The IIN flags are set by the slave to indicate the events in the following table. The events are bit
mapped to the Modbus register. All bits except Device Restarted and Time Synchronization required
are cleared when the slave station receives any poll or read data command. The master will write to
bits 5 and 11 depending on the local conditions in the master.
Bit
Description
0
last received message was a broadcast message
1
Class 1 data available
2
Class 2 data available
3
Class 3 data available
4
Time Synchronization required
5
not used (returns 0)
6
Device trouble
Indicates memory allocation error in the slave, or
For master in mimic mode indicates communication failure with the slave
device.
7
Device restarted (set on a power cycle)
8
Function Code not implemented
9
Requested object unknown or there were errors in the application data
10
Parameters out of range
11
Event buffer overflowed
Indicates event buffer overflow in the slave or master. The slave will set this
bit if the event buffer in the slave is overflowed. The master will set this bit if
the event buffer in the master has overflowed with events read from the
slave. Ensure the event buffer size, in the master and slave, is set to a value
that will ensure the buffer does not overflow and events are lost.
12
not used (returns 0)
13
not used (returns 0)
14
not used (returns 0)
15
not used (returns 0)
The OK button checks the data for this table entry. If the data is valid the dialog is closed. If the
table data entered is invalid, an error message is displayed and the dialog remains open. The table
entry is invalid if any of the fields is out of range. The data is also invalid if it conflicts with another
entry in the table. Such conflict occurs when the station number is not unique. The ordering of items
in this table is important.
The Cancel button closes the dialog without saving changes.