Configuring The Cj1W-Prt21 Slave Unit - Omron CJ1W-PRT21 Operation Manual

1 Features and System Configuration
1-2 Configuring the CJ1W-PRT21 Slave
Unit
After making the physical connections of the network (see 2-3 Network Installation), the PROFIBUS-DP
system needs to be configured. For each master and its assigned slaves, a configuration has to be
defined using a dedicated configuration program called CX-ConfiguratorFDT. This program provides
the master with information about
• The slaves that are connected to the master.
• The assignment of slaves to groups for broadcast / multicast messages.
• The mapping of the slaves into the memory of the master.
• The bus parameters (e.g. baud rate, target rotation time etc.).
To configure a master unit to communicate with the CJ1W-PRT21, the Unit's device database file
OC_0602.GSD is required. Based on the contents of this file, the configuration program for the master
unit will allow the user to specify the amount of input and output data to be exchanged. The sizes of the
in and the output block can both be set in 1 word increments from 0 to 100 words.
Additional Information
For more information on CX-ConfiguratorFDT, refer to CJ-series PROFIBUS Master Unit Opera-
tion Manual for NJ-series CPU unit (Cat. No. W509).
 Modular Slave
The CJ1W-PRT21 is characterized as a modular slave. The following types of data exchange mod-
ules are pre-defined:
• IN: modules of 1, 2, 4, 8, and 16 words
• OUT: modules of 1, 2, 4, 8, and 16 words
• IN/OUT: modules of 1+1, 2+2, 4+4, 8+8, and 16+16 words
By concatenating up to 32 modules, any desired size of input and output block can be created (mul-
tiple selections of any module type are allowed). The sequence in which the modules are entered is
irrelevant. Only the resulting total lengths of the input and output areas are of significance.
 Check Configuration
Upon startup of the PROFIBUS-DP communication, the master unit will send a Chk_Cfg message
so that the slave can verify that the master's expected I/O configuration for the slave is correct.
The CJ1W-PRT21 Slave Unit will accept any in/out words up to 100 input, 100 output words. The
maximum of input + outputs must be 180 words or less.
 Parameter Data
The Set_Prm telegram will provide the following information at system startup, after a restart and in
data exchange mode:
• Start address of the area in the host CPU where to read and to send to the master.
• Format (Motorola/Intel) of the data to be sent to the master.
• Actions to be taken in case of CPU status change or fatal errors.
• Inclusion of 2 words CPU status information or not.
The setting and descriptions found in CX-Configurator FDT are shown below.
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CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)