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1 Features and System Configuration
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
1-3 PROFIBUS Slave Unit
1
1-3-2 Performance
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.
Profibus Interface
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
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