Omron ETHERNET DIRECT DR 170 14 - Manual (Page 37)

Klinkmann Automation Omron Ethernet DAServer 35
Omron Ethernet DAServer Ver 1.x User Manual Rev 1.4 17014m14
CHAPTER 4
Item Names
The Omron Ethernet DAServer supports item/point names consistent with the point
naming conventions used by OMRON PLCs and programming software. The Server
supports almost all memory areas of the following OMRON PLC types: CS1, CJ1,
C200HX, C200HG, C200HE, CV-series, C-series, CPM2x and CQM1.
Contents
• Item Name General Format
• OMRON PLC’s Item Naming
• DAServer Standard System Items
• Generic OPC Syntax
Item Name General Format
In this section the general Item naming conventions used by OMRON Ethernet DAServer
are explained.
Each Integer, Discrete or Floating Point item generally may be described as:
PnS
Each item, representing bit in word, may be described as:
Pn:b (or Pn:bb or Pn.b or Pn.bb)
Each ASCII string item generally may be described as:
Pn-PhS
where:
n -
specifies the Memory area word/bit address of the specific word, flag or bit or
lowest-numbered address of ASCII string.
b (bb) - specifies the bit number in word (b can be 0…9 and bb can be 00…15). Number
of digits in bit item name with separator is not relevant (leading zeroes are not
necessary).
h -
Specifies the highest -numbered address of ASCII string.
P - optionally used prefix, one, two or three characters before Memory area address,
and designates the type of Memory area.
S -
optionally used suffix - a letter after address, which is used to change the default
format of data. The following presents the OMRON Ethernet DAServer supported
data formats and suffixes, indicating corresponding format.
Unsigned/Signed Format
The server interprets 16-bit word in a PLC in 16-bit unsigned format (value limits 0
to 65535) or signed format (value limits -32768 to 32767). Unsigned quantities may
be read by one of two methods - by entering item name without suffix or appending
the suffix 'U' (or 'u') to the item name. For example, channel DM100 in a PLC