Functions of Computer Communication Unit | FP2−CCU |
1.4Communication Conditions and Restrictions Relating to Functions
1.4Communication Conditions and Restrictions Relating to Functions
1.4.1Precautions when Using the FP2 CPU Unit −1
If the processing of commands and responses sent from a host computer or display panel extends over multiple frames, a busy error (error code 53) will be returned to other ports if communication is currently being carried out on one port, and communication will be inhibited on those other ports. Combinations to which this restriction applies are shown in the diagram below.
メインメニュー | 3時5 | 15 |
照明制御を選択 AM |
| |
空調制御 | ～L～ | |
～ ～ | ||
| 館内掲¦ | 板 |
～ ～
～
Powersupply CPU CCU CCU CCU
B 
A 
A 
A 
A B 
B 
B
For example, during the time that a program is being read at the tool port of the CPU unit, a communication error will occur at the display panel connected to the COM.1 port of the Computer Communication Unit.
Group A . . . . . Group comprising the tool port of the CPU unit and the COM.1 port of the Computer Communication Unit
Group B . . . . . Group comprising the COM. port of the CPU unit and the COM.2 port of the Computer Communication Unit
A similar restriction also applies if access is being made from another station connected with the link unit.
Unit No. 1 (source station) | Unit No. 2 (other station) | |||||
Power | CPU CCU CCU MW | Power | CPU | MW | ||
supply |
|
|
| supply |
|
|
| B | A | A |
| B |
|
| A | B | B |
| A |
|
When remote programming is being carried out from another station connected with a Multi−wire Link Unit (MW), a communication error will occur at the Group A ports on the source station side.
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