The Modbus module with 6 analog inputs and 2 relay outputs was developed for decentralized switching tasks. Suitable to monitor electrodes of leakage sensors or the fill level of fluid containers and to switch pumps or magnetic valves. In this case it is necessary to protect the relay contacts by appropriate load-dependent measures. The resistance of the conductive fluid is measured when the electrodes are immersed. It is also possible to signal a cable break (requires sensor LKS-ZD). The module can be operated independently or via a Modbus master. Inputs and outputs can be switched and scanned via standard registers. Module address, bit rate and parity are set with two rotary switches on the front or by software.Suitable for decentralized mounting on DIN TH35 rail according to IEC 60715 in electrical distribution cabinets.

Technical Specifications

• Protocol Modbus RTU
• Address range 00 to 99
• Bus interface RS485 (two-wire bus)
• Transmission rate 1200 to 115200 bit/s
• Operating voltage 24 V AC/DC ± 10 % (SELV)
• Current consumption 80 mA (AC) / 43 mA (DC)
• Relative duty cycle 100 %
• Input / contacts 1 to 6 connection of the electrodes
• Input / contacts C common reference potential
• Internal resistance 20 kOhm
• Sinus voltage 3 Veff, 70 Hz at resistance measurement
• Measuring accuracy ±10 % with sensor resistance 4 to 40 kOhm
• ±20 % with sensor resistance 2 to 100 kOhm
• Pulse voltage ±16 V at wire break monitoring
• Zener diodes 6.2 to 10 V can be used as line termination
• Lines capacity 40 nF max. equates 400 m at 100 nF/km
• Measuring interval 1.5 s
• Output / contacts 2 NO contacts (SPST-NO)
• Output / switching voltage 250 V AC
• Output / continuous current 6 A / output
• Display Green, red and yellow LED
• Dimensions (W x H x D) 50 x 69.3 x 60 mm
  Weight 126 g
• Operating temperature range -5 °C to +55 °C
• Storage temperature range -20 °C to +70 °C
• Ingress protection
  for housing / terminal blocks IP40 / IP20