CTI 2572-B - Chapter 7. Plc Command Interface Overview; Module WX;WY Words

CTI 2572-B / 2500C-2572-B Installation and Operation Manual 27
CHAPTER 7. PLC COMMAND INTERFACE OVERVIEW
When used for server applications only, the 2572-B module requires no PLC logic. However, if you wish to set
the module IP parameters via a PLC program or initiate communications with other devices supporting the
CAMP protocol, the 2572-B provides a PLC Command Interface that allows PLC logic to control the operation
of the module. This chapter provides and overview of the PLC Command Interface
NOTE:
The 2572-B Command Interface is the same as the CTI 2572-A and CTI 2572 modules.
The PLC Command Interface consists of two structures:
7.1. Module WX/WY Words
The 2572-B module logs in as a Special Function module using two WX words and six WY words. PLC logic
uses the WY words to control module operation and the WX words to monitor module operation.
Command Status Word
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Module Status Word
CMD 1
Status Bits
WX1
WX2
WY3
WY4
WY5
WY6
WY7
WY8
Command Slot 1: V Memory Address of Command Block for CMD1
Command Slot 2: V Memory Address of Command Block for CMD2
Command Slot 3: V Memory Address of Command Block for CMD3
Command Slot 4: V Memory Address of Command Block for CMD4
CMD 2
Status Bits
CMD 3
Status Bits
CMD 4
Status Bits
Command Control Word
CMD 1
Control Bits
CMD 2
Control Bits
CMD 3
Control Bits
CMD 4
Control Bits
Module Control Word
• The Module Status Word contains bits that allow the PLC to monitor the operation of the module,
• The Command Status Word contains bits that allow the PLC to monitor execution of commands,
• The Module Control Word contains bits allow the PLC to control module global operation,
• WY4 contains four sets of bits that allow the PLC to initiate commands and clear errors,