Product type: Pt 100/Pt 1000/PTC temperature relay with network and bus interfacesModel / Part number: TR660IP, T224371 (RS485 Modbus RTU variant)Sensor inputs: 6 × Pt 100, Pt 1000 or PTC thermistor (mixed sensors possible, 2‑wire or 3‑wire)Number of alarm limits: Up to 7 alarm setpoints / output relaysSensor monitoring features:“2 of x” alarm evaluation (alarm triggers only when 2 sensors exceed limit)Monitoring of temperature differences between sensorsMonitoring of rate of temperature change (ROCOT)Logging of temperatures and historyDisplay: Color LCD for measured values, alarm states and navigation; joystick control on deviceOutputs:7 × relay outputs with change‑over contacts (K1…K7)RS485 interface with Modbus RTU protocol (read/logging)Ethernet TCP/IP interface with web server and Modbus TCP (network access)Universal power supply: AC/DC 24…270 V (50/60 Hz)Monitoring range: −199.9 °C to +800 °CSwitching delay (configurable): 00:00…59:59 (mm:ss)Protection class: Housing IP30 / Terminals IP20Operating ambient temperature: –20 °C … +65 °CDimensions: approx. 140 × 90 × 58 mm (width × height × depth), mounting height ~55 mmMounting: Snap mount on 35 mm DIN rail or M4 screwsCompliance / Standards: EN 61010, EN 61326, CE/UKCA, UL (typical)Weight: approx. ~400 g