Product specifications

TC562 Modem Unit – (Westermo MD-12DC) Appendix A Hardware Units
390 3BSE036351-510 A
equipment or units, for example a computer and printer or a robotic device. ABB
recommends their use when the distance between units/equipment exceeds 15 m.
For further details refer to the manufacturer's documentation (Westermo).
Using a modem allows distances between pieces of equipment to be as much as
18000 m, and, depending on the distance, can provide a data transmission speed of
up to 38400 bit/s. The modems are manufactured for simple mounting onto a
standard 35 mm DIN-rail.
Transfer between modems takes place along two twisted pair cables, one at full or
half duplex and the other at simplex. The transfer distance is fully dependent on
cable resistance and capacitance. ABB recommends a minimum cable gauge of
0.2 mm
2
with a capacitance of 40-80 pF/m within an industrial environment.
For an office environment, ABB recommends a minimum cable of 0.14 mm, and a
capacitance of 40-100 pF/m. Use a shielded cable in a heavy industrial environment
and an unshielded cable in an office environment. A shielded cable is often given a
higher capacitance and will therefore provide a higher data transmission speed.