ProSoft Technology 5201-MNET-101S - Manual (Page 101)

IEC-101 Slave ♦ ProLinx Communication Gateway Reference
IEC 60870-5-101 v3 Slave (Firmware version 3.xx) Protocol Manual
ProSoft Technology, Inc. Page 101 of 159
August 6, 2010
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
The gateway calculates the Low Limit and High Limit values using the formula
below (so these values cannot be changed dynamically)
Low Limit = (LAST REPORTED VALUE) - Deadband
High Limit = (LAST REPORTED VALUE) + Deadband
These commands must be sent to a specific Information Object Address. The
gateway associates each monitor measured point with a parameter point through
the following configuration parameters: