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<7. I/O Communications >
7-1
IM 34M6H28-01E
1st Edition : Feb.01,1999-00
7.
I/O Communications
The operation of this module related to scanning and I/O communications is explained
here.
7.1
Scan List
The scan list of this module is explained here.
■
What is a scan list?
Node identification information, the communication type, I/O data size and I/O data storage
location are stored in the scan list for each node that communicates with this module. The
communication target node is managed and I/O communications and message communi-
cations are executed according to this list.
Register the following information as Node Identification Information.
•
Vendor ID
: Identifier for the company manufacturing the device
•
Device type : Code indicating the type of device
•
Product code : Code indicating device model
Register the communication type by selecting the following options.
•
I/O communications (select from Polling/Bit Strobe) / None
•
Message communications / None
Register the I/O data size by specifying the size of the I/O data for I/O communications in
the number of bytes and register the location for storing the I/O data by specifying the
relative location (Offset from the start of the input data buffer or from the start of the output
data buffer) in the I/O data buffer of this module.
An example showing the registration of a device list is given below.
Example: SI Unit Compatible with DeviceNet (SMC Co., Ltd.)
Item
Example
Vendor ID
7 (SMC Co., Ltd.)
Device type
16
Product code
288
Communications type
polling only
Input data size (bytes)
2
Input data offset (bytes)
100
Output data size (bytes)
2
Output data offset (bytes)
100
T0701-1.EPS
SEE ALSO
For information on the node identification information, the communications type supported and the I/O
data size, see also the device handling manual or data sheet (hard or soft copy). You can also inquire at
the sales department of the company manufacturing the device.
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