KONTRAC SafeHMI system platform consists of Safe Human-Machine Interface (HMI) and Distributed Safe I/O.
The platform (modules) is assessed by TÜV SÜD for the highest Safety Integrity Level, SIL4 according to CENELEC standards EN 50126-1/EN 50128/EN 50129.
KONTRAC SafeHMI system platform is a modular HW&SW platform developed especially for functional safety applications.
The system consists of SafeHMI and multiple hardware modules of Safe I/O:
- Motherboard
- CAN communication module
- Power supply
- Digital inputs modules (8 and 16 channels)
- Digital output module (2 channels)
During the development of the SafeHMI platform, we enforced an innovative approach to accomplishing the highest level of safety. It combines one- and two-channel architecture together with the interaction between HMI layout and operator to detect errors.
The operator can use an integrated keyboard, but to confirm safety-critical commands, additional safety buttons need to be used.
Safe I/O components come in two identical, independent channels. It is possible to connect up to four Safe I/O systems with the same SafeHMI display.
During type testing, the SafeHMI platform successfully passed all safety tests and met SIL 4 safety requirements. TÜV SÜD assessed the SafeHMI platform to SIL 4 compliance according to standards EN50126, EN50128, and EN50129.
The main application of SafeHMI components is to realize safety systems where human lives are exposed to dangerous situations. These applications are e.g., railway level crossing control and other railway safety applications.
SafeHMI system modules
Safe digital inputs and outputs module sVDO0201
sVDO0201 is a digital output module, which contains two safety relays equipped with forcibly guided contact structure that enables detection of contact welding and construction of safety circuits. Each channel has three terminals: normally closed (NC), normally open (NO) and relay common terminals (IC). Module communicates with sVCAN&PS01 controller via local CAN bus.
Safe digital inputs and outputs module sVDI1602
sVDI1602 digital input module is used for filtering, conditioning and acquisition of digital inputs. Digital inputs are divided in 4 groups of 4 channels. Each group has a separate ground. Channels support 24 V DC nominal input voltage. Inputs are protected from transient overvoltage’s and reverse polarity. Module communicates with sVCAN&PS01 controller via local CAN bus.
Safe digital inputs and outputs module sVDI0803
sVDI0803 digital input module is used for filtering, conditioning and acquisition of digital inputs. Module monitors eight digital inputs divided into 2 groups of 4 channels. Each group has a separate ground. Channels support 60 V DC nominal input voltage. Inputs are protected from transient overvoltages and reverse polarity. Module communicates via local CAN bus.
Safe communication and power supply modules sVCAN and PS01
sVCAN&PS01 module performs functionalities of CAN repeater and galvanic separation of the CAN bus, i.e. electrical and logical separation of local CAN bus on the motherboard from external CAN bus. This module is powered by external power supply, and it provides 5 V DC galvanically separated power supply to other SafeHMI I/O modules on the motherboard.
SafeHMI display
SafeHMI display unit is the central part of SafeHMI system. Visual information may be displayed on the integrated LCD TFT display or on the external monitor. For visualization of data are developed Safety display algorithms which are displayed using Safety Sweep method to prove content of display.