MTL838C MTL Instruments Modbus Implementation

The MTL5553 has been specifically developed to extend 31.25kbit/s (H1) fieldbus networks into hazardous areas. It provides power and communication to devices powered through the signal conductors. For installations in which the safe-area bus length is small an internal terminator can be enabled by a switch on top of the module.
The MTL5553 complies with requirements of Fieldbus Foundation™ specified power supply Type 133† (IS power supply). SPECIFICATION
See also common specification
Location of fieldbus device(s)
Zone 0, IIC, T4–6 hazardous area if suitably certified
Hazardous-area fieldbus power supply
18.4V ± 2%
105Ω ±3% dc impedance
80mA maximum current
Maximum cable length
Determined by IS requirements, depending on other devices
attached and maximum acceptable voltage drop along cable
Digital signal transmission
Compatible with 31.25kbit/s fieldbus systems and complies
with fieldbus standards†
Supply voltage
20 to 35Vdc
LED indicator
Green: one provided for power indication
Power requirement, Vs, with 80mA output load
135mA typical at 24V
105mA at 35V
Power dissipation within unit, with 80mA output load
2.3W typical at 24V
2.6W maximum at 35V