Question { HLL, 3906 }

I am in search of PLC with Scan time less than 5ms with
around IO's. Normally i feel its around 30ms. Can any one
suggest?

Answer

for 1 ms i/o scaning you have to selected the soe(Sequence
of event) type card. which is avialable in Schneider
Quantam series. & is you looking for 2- 5 ms i/o scaning
per channel than you can go for Schneider M-340 (Merino
Series) or ABB AC 500 Series.
For any query please contact.
Dev22_abes@yahoo.co.in

Question { 7833 }

HELLO FRIENDS plz tell me which are the PROTOCOLS we are
using in PLC

Answer

DIfferent types of protocol is used in PLC .

1. Modbus RTU/ASCII
2. Unitelway
3. TCP/IP
4. Modnet(Modbus TCP/IP)
5. Devicenet
6. Can Open
7. Profibus
8. Modbus Plus
9. DH+
10.Arcnet
there are more protocols these are used according to your
requerment.

Question { 3631 }

Tell me about the synchronization panel.

Answer

First Know the Synchronization.
We have to check 4 parameter in sequence listed below.
1. Phase Secquence.(this has to be 1 time.basicly this is
the rotation of the phase.)
2.Voltage has to be equal.(but in practical case votlage
difference not more than 2%)
3.Frequency has to be equal .(but in practical case
Frequency difference not more than 2%)
4.Phase angel difference must be zero(but in practical case
phase angel difference not more than 7*)
so we required in Synchronization Panel.
2 volt meter,2 frequency meter,Phase angel check Relay(CSQ)
in case you dont have the csq you can use the dark lamp
mathod.