Chapter 5 Transfering Data with the I/O Scanner
Configuring the I/O Scan List Using Modsoft, continued
Storage
Requirements, continued
z
There are four types of Peer Cop requests: z
Global data input (not supported) z
Global data output (not supported) z
Specific data input z
Specific data output
CAUTION
GLOBAL DATA EXTENSION HAZARD
For the Ethernet TCP/IP network operations, only the specific data input and output are supported. Do not fill in the Global input or Global output. The NOE ignores global data configuration.
Failure to observe this precaution can result in injury or equipment damage.
Depending on your requirements you can estimate the memory needed where: z
If Specific Output is configured, then add 2 words for each device entry (64 maximum. Maximum is 64 x 2 = 128 words z
If Specific Input is configured, then add 2 words for each device entry (64 maximum). Maximum is 64 x 2 = 128 words. Based on the above, the minimum size Peer Cop could be 20 words while the maximum could be 1366 words for each of up to 3 links.
Specific
Input/Output
Configuration
The default screen for Peer Cop entry is labeled “Peer Cop” (see figure on next page). The screen is a data entry template comprising all four data types and providing a summary of settings that apply to the specific link/node as well as timeout, error handling and statement of memory words used.
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Chapter 5 Transfering Data with the I/O Scanner
Configuring the I/O Scan List Using Modsoft, continued
Specific
Input/Output
Configuration, continued
Summary
Information
The cursor is initially in the Head Slot field. If you are not editing an initial template you may press the Esc key which re-positions the cursor to the SPECIFIC INPUT field. To traverse the Heads and Nodes you can re-display the Add Node select box from the main Menu line.
Specific Output
Specific output comes from the Controller, located in the same rack, where the
NOE resides. Specific out data can be set from the NOE to the remote node on the subnet by a Modbus Write. The source of each specific output block is a contiguous region of 0x, 1x, 3x or 4x state RAM, which varies from 1 to 32 words in length. If discretes are used, they must start on a word boundary (00001, 00017, 00033, etc.).
The Type default (BIN or BCD) is put in by the controller. Where different types can be specified, you make the entry from a display list displayed by keying the return key while the cursor is on the TYPE field.
Note: The NOE 771 00 ignores the BIN BCDs setting and always uses a BIN format.
Continued on next page
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