Allen-Bradley MicroLogix 1400 User Manual

Rockwell Automation Publication 1766-UM001I-EN-P - June 2015 263
MicroLogix 1400 Distributed Network Protocol (DNP3) Appendix F
ladder logic or communications, the MicroLogix 1400 clears it automatically
after generating an event at the end of scan. The bit DCE is used to suppress the
events by the change of state.
For example, if you want to trigger an event for an analog point every 15 minutes,
you should set the TE bit every 15 minutes by the ladder logic. But, in this case,
you may not want the state change events to be generated. Then, set the bit DCE.
You can get the timed events every 15 minutes.
Related Configuration File Number:
• 16-bit Counter Config File Number
• 32-bit Counter Config File Number
• 16-bit Frozen Counter Config File Number
• 32-bit Frozen Counter Config File Number
• 16-bit Analog Input Config File Number
• 32-bit Analog Input Config File Number
• Short Floating Point Analog Input Config File Number
For Counter type data, you can configure Threshold information in the
Configuration file. Each element can be configured to the threshold value for
each point. A counter event is generated if the absolute value of the difference
between the present value of a counter point and the value that was most recently
queued as an event for that point exceeds the threshold value that was configured
in this file.
Related Configuration File Numbers:
• 16-bit Counter Threshold Config File Number (In Series B)
Class and Object Configuration for Other Input Data Type
Bit Offset 1514131211109876543210
Element 0 F7F6F5F4F3F2F1F0r r DCETEr r C1C0
Element 1 F7F6F5F4F3F2F1F0r r DCETEr r C1C0
Element 2 F7F6F5F4F3F2F1F0r r DCETEr r C1C0
Element 3 F7F6F5F4F3F2F1F0r r DCETEr r C1C0
Element 4 F7F6F5F4F3F2F1F0r r DCETEr r C1C0
Element 5 F7F6F5F4F3F2F1F0r r DCETEr r C1C0
…
r: reserved
C1/C0: Class level, 0 to 3
TE: Trigger Event for the point (In Series B)
DCE: Disable Change of state Event for the point (In Series B)
For other Inputs, Element _0 for data index 0
F7-F0: Object Flags, FLAG7/FLAG6/FLAG5/LOCAL_FORCED/REMOTE_FORCED/COMM_LOST/RESTART/ONLINE

Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes