Preliminary Considerations; Self Test - Pepperl+Fuchs IDENT-I system P IPT FP Series Manual

IPT*-FP WITH U-P6-B5-V
Commissioning
6.2

Preliminary considerations

Due to the complexity of field bus programming with the INTERBUS it is very difficult to make
generally valid statements about commissioning.
A very important aspect of the operation of an inductive identification system with the lower
section on the INTERBUS is the time response of the overall system. The question, "How long
after the positioning of a data carrier in front of a read/write station will the read data be
available in my computer?" is answered with the aid of knowledge of the INTERBUS protocol
structure and the following formula:
t = [182 + 1,5 x m] x t
ü
t = Transfer time
ü
m = Number of remote bus stations
installed
t = Bit duration
B
it
= Software run time
t
s
w
On large projects, or if you have little experience of programming an INTERBUS system, you
should, in any case, construct a laboratory set up of your application and test the data transfer
to the INTERBUS master before installing the system in the plant.
Note!
The "CMD" manufacturer-independent program is available for planning, commissioning and
diagnosing INTERBUS networks.
Details of this program and information on the general theme of INTERBUS are available from:
INTERBUS-Club
Postfach 11 08
D-32817 Blomberg
Tel: +49 52 35/ 34 21 00
Fax: +49 52 35/ 34 12 34
6.3

Self test

When the power supply is switched on the device executes a self test in its internal memory. If
the error "RAM defect" or "ROM defect" occurs, the communication is not activated. If no error
occurs, then the connection to the INTERBUS master is established automatically.
18
+ t
Bit sw
2 μs corresponding to 500 kBit/s or
t =
B
it
0.5 μs corresponding to 2 MBit/s
t =
B
it
200 μs
=
t
s
w