Preliminary Operations; General Information; General Points - Algodue ELETTRONICA 485-MDB-20 Instrucciones De Servicio

485-MDB-20 - JBUS/MODBUS

PRELIMINARY OPERATIONS

For personnel and product safety please read the
contents of these operating instructions carefully be-
fore connecting.
Check the following points as soon as you receive the
485-MDB-20 package:
• the packing is in good condition,
• the product has not been damaged during transit,

GENERAL INFORMATION

Functions
The optional Communication module must be connec-
ted to the UPA20. It provides an RS485 serial link (2 or
3 wires) with JBUS/MODBUS
UPA20 from a PC or PLC.
Programmable
controllers
Other systems
Programmable
controllers
Other systems
Recommendations:
You should use a shielded twisted pair (LIYCY type). In
a disturbed environment or large network (in terms of
length) we recommend the use of a shielded twisted
pair (type LIYCY-CY).
A repeater (1 channel) or an arrestor (4 channels)
should be used if you intend to exceed the distance
(1200 m) and/or maximum number (31) of UPA20.
Please contact us for more information.
14
485-MDB-20
®
protocol for the use of
®
R = 120
R = 120
• the product reference number conforms to your or-
der,
• the package contains the product and the operating
instructions.

General points

For a standard configuration, an RS 485 link is used to
connect up to 31 UPA20 with a PC or a PLC over a
distance of 1500 metres, using JBUS/MODBUS
tocol.
1200 M
N 1 N 2
1200 M
0+- -+0
N 1 repetor
RS485
NB :
A 120 ohm resistance (found on the additional module)
must be fixed at both ends of the link.
Other solutions are available (modem, TCP-IP, optical
fibre, etc.). Please contact us
pro-
©
N n
R = 120
1200 M
N n
R = 120