ISO 20663:2020 Ships and marine technology — Grab dredger supervisory and control systems.
4 Components and structure
4.1 Components
The grab dredger is a dredger that excavates the soil with a grab.
The GD-SCS is an integrated system which consists of a SCADA and a DPM.
The SCADA is used to monitor and control the dredging process with a grab.
The main functions of the DPM are to measure the position and heading of the grab dredger, and the position and depth of the grab bucket, and to provide for visualization in the plan view with a numeric window and side views.
4.2 Structure
By using either a wireless or wired network, the GD-SCS consists of a collector, a controller, monitoring stations, etc. respectively in the grab dredger’s control room, the operator’s cabin or elsewhere, in order to monitor the dredging and the operations of the grab dredger moving and manipulation equipment.
5 General requirements
5.1 Operating position and control mode
5.1.1 Operating position
The GD-SCS should have a local and, where deemed required, a remote operating position.
5.1.2 Control mode
The GD-SCS should have the following control modes:
a) manual: manual operation by handle/hutton/knob/pedal and HMI;
b) emergency: direct operation through hard wire, only for dredging equipment that affects the safety of the grab dredger.
5.2 External communication
The GD-SCS should have the following communication interfaces:
a) the position measurement system of the vessel;
b) the heading (orientation) measurement system of the vessel;
c) the tide measurement.
5.3 Diagnostic
When the equipment start and stop controls, the operation position transfer, or the control mode shift
operation fail, the GD-SCS should provide diagnostic information.
5.4 HMI graphics
5.4.1 Alarm level
In HMI graphics, the GD-SCS alarm level can be set in two colours.
EXAMPLE Red is the highest level alarm, meaning danger; yellow is the secondary level alarm, meaning warning or abnormal condition.
This principle can be applied to all graphical symbols, function-keys, and digital data.
5.4.2 Conventions on graphic colours
The [IMI graphic colours can be specified as follows.
a) For HMI graphics, cold tone colours are recommended, and for non-operating graphical interfaces, warm tone colours can be adopted.
b) The colour matching of the HMI graphics should make the flow chart simple and clear with harmonious and consistent colours. It is advisable that the number of colours adopted not be excessive.
c) Colour adoption of the HMI graphics can be in accordance with the specifications in Table 1.ISO 20663  pdf download.