Description
Honeywell IOTA2851307198-175
Technical Specifications
- Compatible I/O Modules: Safety Manager SAI, SAO, SDI, SDO series safety modules
- Signal Type: 4-20mA analog signal, 24VDC discrete signal
- Working Temperature: -20°C to +70°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5% to 95% RH non-condensing
- Isolation Rating: 1500VAC field side to logic side isolation
- Mounting: DIN rail mounting inside SIS cabinet
- Certification: TÜV SIL2, UL, CE, ISA G3 conformal coating
Functional Features It provides removable screw terminal blocks for convenient field wiring and maintenance. Each channel integrates surge suppression circuit for lightning and transient voltage protection. It transmits loop fault diagnostic signal from field wiring to matched I/O processor module. It has clear printed channel marking on terminal cover. It supports signal wiring for safety instrumented loops. It uses dedicated interconnection cable to communicate with I/O processor module. It has common ground bus bar for signal reference.
Application Scenarios Offshore oil platform SIS instrument signal termination Petrochemical corrosive environment safety I/O marshalling Refinery furnace safety instrument wiring interface Chemical plant toxic solvent workshop SIS loop termination Natural gas coastal compressor station safety FTA spare part Safety Manager conformal coated IOTA replacement
Performance Parameters
- Signal Transmission Accuracy: ±0.05% full scale for analog loop
- Insulation Resistance: Greater than 1000 MΩ
- Mean Time Between Failures: 920000 hours
- Surge Withstand: 2kV line to ground
- Channel Crosstalk: Less than 0.1%
Material Composition FR4 flame retardant PCB with conformal acrylic coating Nylon UL94 V-0 screw terminal blocks Tinned copper terminal pins TVS transient suppression diodes Precision metal film resistors Transparent polycarbonate marking cover Steel DIN rail elastic clip ABS plastic locking components
Structural Features Flat rectangular DIN rail mount IOTA structure. Front side removable screw terminal block for field instrument wiring. Rear side multi-pin connector mates with interconnection cable to I/O processor module. Internal PCB layout separates field wiring zone and logic connector zone. Ground bus bar runs through the whole board. Transparent cover protects terminal screws and displays channel marking. Back side elastic clip locks firmly on 35mm DIN rail.
Working Principle Field analog or discrete signal enters the field side terminal block. The signal passes through surge protection circuit and isolation barrier. The conditioned signal is transmitted to matched safety I/O processor module via dedicated interconnection cable. The IOTA continuously transfers loop fault condition such as open circuit and short circuit to processor module. The internal ground bus provides stable reference potential for all signal channels.
Installation Requirements Mount IOTA2851307198-175 on 35mm DIN rail and lock the rail clip. Wire field instrument shielded cable to corresponding field side terminals. Connect dedicated interconnection cable between IOTA and matched safety I/O processor module. Configure channel parameters in Safety Manager engineering software. Power on rack and verify signal reading and fault diagnostic function. Separate hazardous zone wiring and safe zone wiring in different cable trays.
Usage Notes Only matched Safety Manager I/O processor modules can be used with this IOTA. Do not remove the conformal coating layer on PCB surface. Shielded twisted pair cable is mandatory for analog instrument wiring. Tighten terminal screws to specified torque to avoid poor contact under vibration. Do not apply AC voltage to any signal terminal. Follow hazardous area installation specification when deployed in explosive zone.
