Detailed description
2.12 Block descriptions
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-133
Parameterization
Signal Type Value range Meaning
PIService ANY PI.LOGIN Create password
Unit INT 1 NCK
Addr1 STRING 8 characters Password
PI service: LOGOUT
Reset password
Function:
The password last transferred to the NCK is reset.
Parameterization
Signal Type Value range Meaning
PIService ANY PI.LOGOUT Reset password
Unit INT 1 NCK
Semaphores for PI services
MMCSEM
For use by MMC and PLC
10 semaphores are provided for each channel. These protect critical functions for the
MMC/PLC. By setting the semaphore for the corresponding function number, several
MMC/PLC units can be synchronized with it in cases where a function contains a critical
section with respect to data to be fetched by the NCK. Semaphores are managed by the
MMC/PLC. A semaphore value of 1stipulates a Test & Set operation for the semaphore of
the specified function number. The return value of the PI service represents the result of this
operation:
• Return value OK:
Semaphore has been set, critical function can be called.
• Return value REJECTED:
Semaphore was already set, critical function cannot be called at the present time. The
operation must be repeated later.
Note
On completion of the operation (reading data of this PI service) it is essential that the
semaphore is enabled again.
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