7SR224 Argus Data Comms
Binary Output Status Points and Control Relay Output Blocks
The following table 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. (The “actual” status value, as 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.
Binary Output Status Points
Static Object Number: 10
Change Event Object Number: 11
Default Variation reported when variation 0 requested: 2 (Binary Output with flags)
Default Change Event variation 0 requested: 2 (Binary Output absolute time)
Control Relay Output Blocks
Object Number: 12
All objects are default class 2
Point
Index
Name/Description
Supported Control Relay Output Block
Fields
1 Binary Output 1 Pulse On/Latch On
2 Binary Output 2 Pulse On/Latch On
3 Binary Output 3 Pulse On/Latch On
4 Binary Output 4 Pulse On/Latch On
5 Binary Output 5 Pulse On/Latch On
6 Binary Output 6 Pulse On/Latch On
7 Binary Output 7 Pulse On/Latch On
8 Binary Output 8 Pulse On/Latch On
9 Binary Output 9 Pulse On/Latch On
10 Binary Output 10 Pulse On/Latch On
11 Binary Output 11 Pulse On/Latch On
12 Binary Output 12 Pulse On/Latch On
13 Binary Output 13 Pulse On/Latch On
14 Binary Output 14 Pulse On/Latch On
15 Binary Output 15 Pulse On/Latch On
16 Binary Output 16 Pulse On/Latch On
17 Binary Output 17 Pulse On/Latch On
18 Binary Output 18 Pulse On/Latch On
19 Binary Output 19 Pulse On/Latch On
20 Binary Output 20 Pulse On/Latch On
21 Binary Output 21 Pulse On/Latch On
22 Binary Output 22 Pulse On/Latch On
23 Binary Output 23 Pulse On/Latch On
24 Binary Output 24 Pulse On/Latch On
25 Binary Output 25 Pulse On/Latch On
©2010 Siemens Protection Devices Limited Chapter 4 Page 49 of 76
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