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DA70131-1/3E
I-31
5. Description of the software
5-1. Outline of control
5-1-1. Communication control
- The center device controls all the communications.
- One communication cycle consists of a communication from the center device to the local devices, and the
communication from the local devices back to the center device.
- The response from the local devices may include I/O information and data.
5-1-2. Communication type
System communications, cyclic communications, and data communications are the three communication types
available.
1) System communications
System communications automatically confirm the connection status, device type, and I/O port settings of each
local device.
By writing a system communication start command (1000h), the center device polls all of the local devices (device
No. 0 to 63), one by one, and refreshes the "device information" area according to the response from the local
devices.
8 bits are used for the device information about each device.
7 6 5 4 3 2 1 0
0 0 0
(Device information
I/O setting
Set value
Port0
Port1
Port2
Port3
PMD2
PMD1
PMD0
000
Output
Output
Output
Output
L
L
L
001
Input
Output
Output
Output
L
L
H
010
Input
Input
Output
Output
L
H
L
011
Input
Input
Input
Output
L
H
H
Other
than the
above
Input
Input
Input
Input
Other than the above
When a local device is a data device (G9103A, G9004A) , each port is used to
exchange data (status or general-purpose ports) that has different meanings
for each device.
Device type
0: I/O device
1: Data device
Use of device
0: Do not use
1: Used
"When the "device information" is already known, you can write data from a CPU.
When a system communication is started during cyclic communication, the center device halts the cyclic
communication and executes the system communication which has a higher priority. After the system
communication is complete, the center device will restart the cyclic communication.
Even if cyclic communications are halted, the center device can still execute system communications.
Содержание Motionnet G9001A
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