| Author | Message | | | eric | | Posted: Thu Oct 05, 2006 11:27 pm Post subject: LOGO! Interface | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | needed to connect a PLC of the
Siemens LOGO! series to the serial
interface of a PC. Of course,
you can obtain such a cable
ready-made (at a price!), but
you can also make one yourself
inexpensively.
The interface circuit consists of
a galvanic isolator and a level
converter. The galvanic isolation
is provided here by a dual
optocoupler (Sharp PC827),
although two single PC817
optocouplers could be used
instead, or other types as long
as their current transfer ratio
(CTR) is at least 50% at a forward
current IF of 5mA. Since
the two optocouplers are built
as inverters, a pair of inverter
gates must be used to restore
the signals — IC3a (to the PC)
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| martin | | Posted: Sat Oct 07, 2006 11:48 pm Post subject: Thx | | | | Joined: 27 Aug 2006 Posts: 4 | |
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