14
PROFIBUS-DP Master Unit
Section 1-3
1-3-3 Comparison with Previous Model
The following table provides a comparison between the CS1W-PRM21/
CJ1W-PRM21 PROFIBUS-DP Master Units and their predecessor, the
C200HW-PRM21 PROFIBUS-DP Master used in a CS-series PLC
Item C200HW-PRM21 CS1W-PRM21/CJ1W-PRM21
Unit classification C200H Special I/O Unit CPU Bus Unit
Mounting position • CPU Rack,
• C200H I/O Expansion Rack,
• CS-series Expansion Rack
• Can not be mounted on a CS1D PLC
• CPU Rack,
• CS/CJ-series Expansion Rack
• CS1W-PRM21 can be mounted on CS1D
Applicable Unit numbers 0 to F (Hex) 0 to F (Hex)
Maximum number of Units
per PLC
16 16
Allocated CIO Area words 2,000 to 2,004 + (10 x unit number)
Up to 4 CIO words contain:
• Command settings
• Unit Status and error flags
• Error reporting from the PROFIBUS inter-
face
1,500 to 1,524 + (25 x unit number)
Up to 25 CIO words contain:
• Command settings
• Unit Status and error flags
• PROFIBUS status and error flags
• Slave status flags
Allocated DM Area words D20000 to D20017 + (100 x unit number)
The area contains user defined memory
mapping of I/O data
At start up this area is transferred to the Unit
D30000 to D30099 + (100 x unit number)
Not used on the Unit. Reserved for future
use
I/O Data allocations Maximum total size: 300 words per Unit
I/O Data words can be allocated to up to 2
input areas and 2 output areas
I/O size per area: up to 200 words
Mapping / area size set in DM words:
• CIO: CIO 0000 to CIO 0235
• CIO: CIO 0300 to CIO 0511
• CIO: CIO 1000 to CIO 1063
• HR: HR000 to HR099
• DM: D00000 to D05999
Default mapping (DM words contain 0000):
• Output area: CIO 0050 to CIO 0099
• Input area: CIO 0350 to CIO 0399
• Diagnostic flags: CIO 0200 to CIO 0215
Maximum total size: 7168 words per Unit
I/O Data words can be allocated to up to 2
input areas and 2 output areas
I/O size per area: up to 7168 words
Mapping and area size set by Configurator:
• CIO: CIO 0000 to CIO 6143
• WR: W000 to W511
• HR: HR000 to HR511
• DM: D00000 to D32767
• EM: E00000 to E32767 (Banks 0 to C)
Default mapping: Not supported
Note Diagnostics flags: available in allo-
cated CIO Area words
Message communications Message communication using IOWR and
IORD PLC instructions:
• IOWR to send Global-Control command
• IORD to read slave diagnostics
FINS message communication not sup-
ported
FINS message communication. Commands
supported:
• MEMORY AREA READ to read Slave sta-
tion diagnostics message
• ERROR LOG READ, to read the Unit’s
error log
• ERROR LOG CLEAR to clear the Unit’s
error log
• RUN to enable communication with a
slave station
• STOP to disable communication with a
slave station
Configuration connection
method
Serial connection (RS232) directly to con-
nector on the front of the Unit
Serial connection directly via PLC CPU, or
via other I/O Units.
No separate connector on the front of the
Unit
PROFIBUS Media type RS-485, galvanically isolated from the PLC RS-485, galvanically isolated from the PLC
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