Siemens 7SR23 DAD Manual page 122

Point
Name/Description
Index
614 LED 14
615 LED 15
616 LED 16
871 Cold Start
872 Warm Start
873 Re-Start
874 Power On
Table 12: DNP3.0 Double Point Binary Input Points
Double Point Binary Input Points
Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Default Static Variation reported when variation 0 requested: 2 (Binary Input with status)
Default Change Event Variation reported when variation 0 requested: 2 (Binary Input Change with Absolute
Point
Name/Description
Index
0 CB1
1 CB2
2 CB3
3 CB4
4 CB5
5 CB6
6 CB7
7 CB8
8 CB9
9 CB10
10 CB11
11 CB12
Table 13 lists both the Binary Output Status Points (Object 10) and the Control Relay Output
Blocks (Object 12).
While Binary Output Status Points are included here for completeness, they are not often
polled by DNP 3.0 Masters. It is recommended that Binary Output Status points represent the
most recent DNP "commanded" value for the corresponding Control Relay Output Block point.
Because many, if not most, Control Relay Output Block points are controlled through pulse
mechanisms, the value of the output status may in fact be meaningless. Binary Output Status
points are not recommended to be included in class 0 polls.
As an alternative, it is recommended that "actual" status values of Control Relay Output Block
points be looped around and mapped as Binary Inputs.
opposed to the "commanded" status value, is the value of the actuated control. For example,
a DNP control command may be blocked through hardware or software mechanisms; in this
case, the actual status value would indicate the control failed because of the blocking.
Looping Control Relay Output Block actual status values as Binary Inputs has several
advantages:
it allows actual statuses to be included in class 0 polls,
it allows change event reporting of the actual statuses, which is a more efficient and
time-accurate method of communicating control values,
and it allows reporting of time-based information associated with controls, including
any delays before controls are actuated, and any durations if the controls are pulsed.
The default select/control buffer size is large enough to hold 10 of the largest select requests
possible.
©2013 Siemens Protection Devices Limited
Chapter 4) 7SR23 DAD Data Communications
Default Variation
Default
Event Object 1
class
2
2
2
2
2
2
2
Default
Default
Variation Event
class
Object 1
2
2
2
2
2
2
2
2
2
2
2
2
Default Variation
Event Object 2
2
2
2
2
2
2
2
Time)
Default
Variation Event
Object 2
2
2
2
2
2
2
2
2
2
2
2
2
(The "actual" status value, as
Chapter 4 Page 44 of 54
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2