Figure 5-2 Communication Control Program Operation - Hitachi IR.LINK User Manual

Communication control program
The main functions are shown below.
• This program transmits and receives data to/from the IR.Station, and when the specific DI
input changes from OFF into ON, it causes an interrupt to the CPU or LPU to call the sub-
OS.
CPU or LPU (+CMU)
I/O area
Interrupt task (*)
(*) In the S10V, the interrupt task is available only when the CMU module is installed.

Figure 5-2 Communication Control Program Operation

Sub-OS
With an interrupt from the communication control program, the interrupt task corresponding to
the DI that has changed (from OFF to ON) is started.
NET status, S-register, and S-table
These are a register and a table in which the communication control program sets data
transmission/reception information and error information.
IR.LINK
I/O buffer
Start
IR.Station
Send/receive
buffer
Interrupt output
5-3
5 USER GUIDE
PI/O
PI/O output
PI/O input