DEUTSCHMANN AUTOMATION ROTARNOCK 100, Инструкция по эксплуатации, Страница: 33 / 58

4.12.20 Instruction manual ROTARNOCK 100 V. 3.6 33
Deutschmann Automation GmbH & Co. KG Networking terminals with cam controls and PCs
6 Networking terminals with cam controls and PCs
The chapter below illustrates certain connection examples between the units both via the DIC-
NET bus and via the RS232 interface.
All DEUTSCHMANN controllers (LOCON, ROTARNOCK ...) with a DICNET bus can be included
in this network. The following principles apply in general:
6.1 RS232 link
An RS232 link is always a point-to-point link for 2 users .
It must be borne in mind that, on connection, the Tx end of one user is connected to the Rx end
of the other user and vice versa. Moreover, the device ground potentials must be interconnected.
6.2 RS485 link (DICNET)
A DICNET link is a bus system to which at maximum configuration level 16 cam controls
(LOCON 32, LOCON 24 ...), 16 display units (TERM 4), 16 operator terminals (TERM 6, TERM
24 ...) and 1 PC can be connected
simultaneously via a twisted two-wire line which should be
shielded.
All "" terminals are interconnected and all "DICNET-" terminals are interconnected. The
terminals do not need to be reversed as on the RS232 interface.
Likewise, not necessarily there is a connection of the individual device ground potentials as on
the RS232 interface;
however, you must ensure that the potential difference between the
individual devices does not exceed 7V.
Consequently, equipotential bonding is generally carried out in practice at a central point (for
example, in the switch cabinet).
Moreover, please ensure that the two bus users feature bus termination resistors at the
start and end of the bus by connecting to R+ and DICNET- to R-
, since, otherwise,
serious transmission problems could occur.
If the devices are connected to the bus with a stub-end feeder, the length of the stub-end feeder
may not exceed 1 m, so as to guarantee trouble-free operation.
6.3 Cable type for DICNET
A shielded, twisted, 2-core cable (twisted pair) is recommended as the bus cable. The shield
serves to enhance electromagnetic compatibility (EMC). However, an unshielded cable may also
be used if ambient conditions permit, i.e. if no electromagnetic interference (EMI) is anticipated.
The characteristic impedance of the cable should be between 100 and 130 *

at f > 100 kHz; the
cable capacitance should be < 60 pF / m wherever possible and the wire cross-section should be
minimum 0.22 mm
2
(24 AWG).
A cable which fully complies with these specifications and which has been developed specifically
for use in field bus systems is the UNITRONIC®-BUS LD cable 2 x 2 x 0.22, available on a drum
from LAPP KABEL in Stuttgart, or by the metre from DEUTSCHMANN AUTOMATION.