CTI 2572-A, Installation And Operation Manual

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CTI 2572-A Installation and Operation Guide
6
Figure 7 illustrates how the module WX/WY words and the command blocks are used together. The
2572-A writes values in the WX words, the PLC writes values in the WY words. WX1 and WY3
contains bits allow the PLC to monitor and control module global status. WY4 and WX2 contain bits
that allow the PLC to trigger commands and monitor command status. The Command Slots (WY5-8)
are used to point to the starting V Memory addresses of the Command Blocks.
To use the module command interface, your PLC logic typically loads a Command Slot with the
address of the desired command block. It then sets a corresponding trigger bit in WY4 to cause the
2572-A to execute the command. Your logic then monitors the condition of the command status bits
in WX2 to determine whether the command completed successfully. Please refer to APPENDIX C.
PLC COMMAND INTERFACE for a complete description.
1.6. Getting Started
Before using the 2572-A module, you will need to perform the following steps. These steps are
described in more detail in CHAPTER 2. INSTALLATION .
Set the Module Switches
Module switches are used to select the startup options and security options.
Install the Module in the PLC I/O Base
The 2572-A is a single wide module that installs in a standard SIMATIC® 505 PLC rack. For best
performance you should install the 2572-A in the first I/O slot of the local base.
Enter the Module in the PLC I/O Configuration
This procedure is accomplished using your PLC programming software. The 2572-A module must be
entered into the I/O configuration before operations requiring PLC logic will work.
MODULE STATUS WORD
COMMAND STATUS WORD
MODULE CONTROL WORD
COMMAND CONTROL WORD
COMMAND SLOT 1
COMMAND SLOT 2
COMMAND SLOT 3
COMMAND SLOT 4
MODULE WX/ WY COMMAND
BLOCKS
WX1
WX2
WY3
WY4
WY5
WY6
WY7
WY8
Figure 4. 2572-A PLC Interface