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1-15
1 Features and System Configuration
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
1-
3 PROFIBU
S
S
lave Un
it
1
1
-3-2
P
e
rforma
nce
The task of the CJ1W-PRT21 is to exchange predetermined amounts of data between the host CPU
system and a PROFIBUS-DP master unit. Its performance in terms of data transfer rate is therefore
mainly governed by two factors external to the Unit: the PROFIBUS-DP cycle time and the host CPU’s
cycle time.
The CPU cycle and the PROFIBUS-DP cycle will generally be:
•
independent,
•
of unequal length,
•
more or less variable,
•
and therefore fundamentally asynchronous.
In case the PROFIBUS-DP cycle time is longer than the host CPU cycle time, it may occur that slave
input data, sent by the Unit’s host CPU only during a single CPU cycle, cannot be read in time by the
PROFIBUS master.
In case the PROFIBUS-DP cycle time is shorter than the host CPU cycle time, it may occur that slave
output data, sent by the PROFIBUS master only during a single fieldbus cycle, cannot be read in time
by the Unit’s host CPU.
Profib
us In
terface
Applicable standard
EN50170 Vol. 2
Conformance to PROFIBUS stan-
dard
Certificate No. Z01033
Bus connector
9-pin female sub-D connector (RS-485 PROFIBUS connector)
Bus address
0 to 99, Remote setting
not supported
Baud rate (auto-detect)
9.6 kbps, 19.2 kbps, 45.45 kbps, 93.75 kbps, 187.5 kbps, 500 kbps, 1.5
Mbps, 3 Mbps, 6 Mbps, 12 Mbps
Supported functions (as
responder)
to DPM1 + DPM2 masters
Data_Exchange
Slave_Diag
Set_Prm
Chk_cfg
Global_Control
(SYNC/FREEZE/CLEAR)
to DPM2 master only
RD_Inp
RD_outp
Get_cfg
Station type
Modular station, max. 32 modules
Configurable with In-, Out-, and I/O-modules of 1, 2, 4, 8, and 16 words
Total of 0 to 100 words in + 0 to 100 words out.
Sum of Input and Output size can be up to 180 words
GSD file
OC_0602.GSD, supplied with the unit
1-3-2
Performance
Model Code
CJ1W-PRT21
1
3
4
1
2
3
4
1
2
3
4
Data sent by host CPU
Data in slave input buffer
PROFIBUS master input data
I/O refresh
Master-Slave polling