ProSoft Technology MVI56-104S - Manual (Page 133)

Reference MVI56-104S ♦ ControlLogix Platform
User Manual IEC 60870-5-104 Server Communication Module
ProSoft Technology, Inc.
Page 133 of 188
November 18, 2009
The client may also dynamically change the deadband for each monitored point.
The client 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
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
1 to 6
5..31 Reserved
0 No Change 7
1 Change
0 Operation 8
1 Not in Operation
For the MVI56-104S module, the Low Limit and High Limit parameters cannot be
changed by command, because these values are calculated as follows:
Low Limit = (LAST REPORTED VALUE) - Deadband
High Limit = (LAST REPORTED VALUE) + Deadband
These commands must be sent to a specific Information Object Address. The
MVI56-104S module associates each monitor measured point with a parameter
point through the following configuration parameters:
M_ME_NA Parameter Offset : 2000 #M_ME_NA IOA offset for parameter data
M_ME_NB Parameter Offset : 2000 #M_ME_NB IOA offset for parameter data
M_ME_NC Parameter Offset : 2000 #M_ME_NC IOA offset for parameter data
Example:
If the following monitored measured points are configured:
[M_ME_NA_1 104]
#
# Default
# Point # DB Address Group(s) Deadband IV DB Bit
# ------- ---------- -------- -------- ---------
START
400 10 00000002 100 # P1 suction pressure
401 11 00000002 100 # P1 discharge pressure
402 12 00000002 100 # P2 suction pressure
403 13 00000002 100 # P2 discharge pressure
404 14 00000002 100 # Station discharge pressure
405 15 00000002 100 # VSD speed
406 16 00000002 100 #