Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 213
Appendix F MicroLogix 1400 Distributed Network Protocol
Internal Indications
Internal Indication bits are set under the following conditions of the
controllers:
• IIN1.0: ALL_STATIONS. This bit is set when an all-stations message is
received.
• IIN1.1: CLASS_1_EVENTS. This bit is set when Class 1 event data is
available.
• IIN1.2: CLASS_2_EVENTS. This bit is set when Class 2 event data is
available.
• IIN1.3: CLASS_3_EVENTS. This bit is set when Class 3 event data is
available.
• IIN1.4: NEED_TIME. This bit is set when Time synchronization is
required.
• IIN1.5: LOCAL_CONTROL. This bit is set when the controller is in Non-
executing mode.
• IIN1.6: DEVICE_TROUBLE. This bit is set when the controller is in Fault
mode.
• IIN1.7: DEVICE_RESTART. This bit is set when the DNP3 driver is just
configured, in channel configuration or when the controller has been
restarted.
To set this bit during the driver configuration and channel
configuration, you need to select the Send Init. Unsol. Null Resp. on
Restart setting and set Status Bit S:36/13 to 1 before downloading to the
controller.
• IIN2.0: NO_FUNC_CODE_SUPPORT. This bit is set when a request
which has an unknown function code is received.
• IIN2.1: OBJECT_UNKNOWN. This bit is set when a request which has an
unknown object is received.
• IIN2.2: PARAMETER_ERROR. This bit is set when a request with a
qualifier/range field that cannot be processed is received.
• IIN2.3: EVENT_BUFFER_OVERFLOW. This bit is set when an event
buffer overflow condition exists in the controller and at least one
unconfirmed event is lost.
• IIN2.4: ALREADY_EXECUTING. Not supported.
• IIN2.5: CONFIG_CORRUPT. This bit is set when a bad file type and bad
file number are detected.
• IIN2.6: Reserved.
• IIN2.7: Reserved.
You can access the last transmitted IIN bits in the response through accessing
the element of Communication Status file, CS0:58 or CS2:58. For more details,
see Diagnostics
on page 262.
DNP3 Objects and Controller
Data Files
All of the DNP3 Objects that are supported in the controller are summarized in
Implementation Table on page 273.
Data file types used in DNP3 Objects are not the same as that used in the
MicroLogix controller, but are similar. Mapping is required between DNP3
data files and controller data files.
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