ABB RTU500 series User Manual page 46

Test & Simulation
Inputs and Outputs view - elements of the user interface
4-10 | 1KGT 150 924 V000 1 - ABB AG
response (positive or negative confirmation) to the command, and sends it to the host system. This
response is the same one that should be expected if the SCO would have not been disconnected
from process.
Figure 54: Disconnecting signals in controlling direction
From the host system's point of view, there is no difference in the process, since the command
output workflow remains the same as usual (a command response is generated by the RTU500
and sent back to the host system). However, the physical output is not executed in the sub-device
(or local output board).
Regarding the user interface, process command outputs (SCO, DCO, RCO, ASO, DSO, FSO and
BSO) are always shown in the signals grid with checkbox and "Se"/"Ex" buttons, since it is always
possible to send output commands locally from the user interface. If the signals are not disconnected
from process in controlling direction, these outputs commands will be physically executed.
When the process command outputs are disconnected from process the text in the row (signal type,
identifier and source) turns bold. From this moment on, the outputs are blocked and the command
responses are simulated.
Figure 55: Disconnection in controlling direction (user interface)
When at least one of the process command signals shown in the signals grid is disconnected from
process in controlling direction, an additional element appears in the control panel for process con-
nection (upper right corner of the user interface):
RTU500 series Remote Terminal Unit