CTI 2572-B / 2500C-2572-B Installation and Operation Manual 21
CHAPTER 6. ETHERNET/IP SERVER
6.1. Overview
Using EtherNet/IP, controllers such as the Allen Bradley Control Logix can read data from and write data to
505 PLCs.
General Description
The 2572-B Ethernet I/P (EIP) server allows an EIP client to access data in a CTI 2500 Series PLC or a Siemens
SIMATIC® 505 PLC. The EIP Server supports reading data from V memory using a CIP
DATA TABLE READ message
and writing data to V memory using a CIP DATA TABLE WRITE message. V memory values can be accessed as 16
bit unsigned integers, 16 bit signed integers, 32 bit signed integers, or 32 bit floating point numbers.
V Memory Concepts
Variable (V) memory consists of a block of 16 bit registers. The interpretation of the V memory register
contents depends on the application accessing the register. V memory registers can be interpreted as a field
of 16 bits, an unsigned 16 bit decimal number, a signed 16 bit decimal number, or a set of ASCII characters.
In addition, two consecutive registers can be combined and interpreted as a 32 bit number (signed integer or
floating point number). For example, if you were writing a block of 2 floating point numbers to V memory
starting with V memory 100, the registers would contain the following data.
Tag Names
Tag Names are used to specify the type of memory to be accessed, the format of the data, and the memory
locations where the data is stored. A Tag Name consists of a Tag Type and a numeric address. The Tag Type
specifies the PLC data element type (e.g. V memory) and the data format. The numeric address specifies the
address of the first data register to be accessed.
For example, the Tag Type VS would be used to access one or more V memory locations as 16 bit signed
integer values. The complete Tag Name VS100 would be used to access V memory address 100 as a signed
integer value.
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