(b) Writing to buffer memory
The following instructions cannot be used to write data to the buffer memory of intelligent function modules
being controlled by other CPUs.
• TO instruction
• Instructions that use inteligent function module device (U \G )
• Intelligent function modules dedicated instructions
An "SP. UNIT ERROR (error code: 2116)" will be triggered if an attempt to write to the intelligent function
module controlled by other CPU is carried out.
CPU
1
0
1
2
3
4
5
2
1
1
1
1
2
Write to buffer memory
is disabled.
Write to buffer memory is disabled.
Figure 3.28 Writing to intelligent function module
CHAPTER3 CONCEPT FOR MULTIPLE CPU SYSTEM
Intelligent function module
Slot number
6
7
2
2
Control CPU setting
1
2
3
4
5
6
7
8
3 - 29