ProSoft Technology MVI56-101S - Manual (Page 141)

MVI56-101S ♦ ControlLogix Platform Reference
IEC 60870-5-101 Slave Communication Module User Manual
ProSoft Technology, Inc. Page 141 of 193
August 2, 2011
Deadbands
The Monitored Measured points (M_ME_NA and M_ME_NB) will generate
events only if the data value changes an amount greater than or equal to the
configured deadband value.
For example, if the following point is configured:
Then, if the current value for this point is 130, it would generate events only if:
 NEW VALUE is less than or equal to 30
OR
 NEW VALUE is greater than or equal to 230.
Each monitored measured point can have it's own deadband value assigned to it
in the configuration file or by using the PCB configuration options.
A network Master may also dynamically change the deadband for each
monitored point. The Master may send one of the following commands:
Type Command
110 Parameter of Measured Normalized Data (M_ME_NA)
111 Parameter of Measured Scaled Data (M_ME_NB)
112 Parameter of Measured Short Floating Point (M_ME_NC)
The protocol specification explains that the qualifier value for these commands
should be configured as:
Bits Value Description
1 to 6 0 Not Used
1 Threshold Value (Deadband)
2 Smoothing Factor (filter time constant) - Not Supported
3 Low Limit Transmission of Measured Value
4 High Limit Transmission of Measured Value
5..31 Reserved
7 0 No Change
1 Change
8 0 Operation
1 Not in Operation