ZIV 7IRD-A - HMI Inputs (Control HMI); Outputting Data from the Control Unit; Outputs through Communications; Signals Sent to the Protection Subsystem

Chapter 7. Description of Operation of the Control Subsystem
7-9
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
7.2.2.d HMI Inputs (control HMI)
Local Orders (OL) are another type of signals that enter the Control Subsystem directly. These
signals are orders about elements that constitute the Single-Line Diagram, received directly
from the Control HMI through the push-buttons O, I, or TAG after the corresponding element
has been determined by means of the selection key NXT.
These signals are subjected to the interlockings defined in the Logic before being executed.
Should the treatment performed by the Logic determine that these orders cannot be executed; a
message will appear indicating a non-executed order.
Local Orders are also sent to the Central Unit to differentiate whether a Change of State has
been generated spontaneously or by manual action. Once encoded in the Output Connection
Process, these signals are sent through Communications.
7.2.3 Outputting Data from the Control Unit
Based on the possible Output paths, the signals that leave the Control Subsystem can be
classified as: Outputs from Communications, Outputs sent to the Protection Subsystem,
Physical Outputs and HMI Outputs.
7.2.3.a Outputs through Communications
They are the signals sent to the Central Unit through Communications via the Remote
Communications Port located on the back of the unit. These signals can be:
 Measurements. The measurements that can be sent to the Central Unit are those
signals picked up by the Protection Subsystem or by the measuring board and those of
the Input Measurement Transducers. These signals are not tagged; instead they are
sent sequentially, and the application used in the Central Unit assigns specific
magnitudes to these values received.
 Counters. They are outcome signals from the Logic processing of Input Signals picked
up through the Input Connection Process and carried out in the element called Counter.
These Counter Measurements are sent directly to the Central Unit without having to go
through any tagging (the signals are sent in the same way as measurements).
 States. The States sent to the Central Unit can be outcome signals from the Logic, as is
the case of the calculated Digital States (EDC), or Input Signals sent directly to the
Control Subsystem, such as the Physical Inputs of Contact Transducers (EF), the
Protection Inputs (EP), or the Local Orders (OL). They all share a common characteristic,
which is that they must all go through the signal coding process called Output Tagging
before being sent to the Central Unit by Communications.
7.2.3.b Signals sent to the Protection Subsystem
The signals sent to the Protection Subsystem are Output orders from the Logic, assigned by the
Output Connection Process.