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Hello, I have a system with two M580 redundant with this configuration:
Rack: BMEXBP0400 / CPU: BMEH582040 / eNOC: BMENOC0301
and this is my network:
Now I have a SCADA and two HMIs that needs to connect to the PLCs and so far I am connecting to them using the Primary eNOC @IP "192.168.3.95" but it seems that the Secondary doesn't swap to the mains @IP automatically when the main is off, is there something I am missing in my configuration or what ? because nor the SCADA nor the HMIs are getting any data when the primary is off.
Because I am used to working with Siemens 17-1500RH and the PLCs create a 3rd shared @IP that the main PLCs use.
SCADA is connected through Kepware server Modbus Suite and the HMI is the HMIST6600.
another question: Is the M580 secondary PLC picks up control on the spot or does it needs operator intervention and only preserves the Data; if so, where can I configure it.
Best regards.
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Hello @the18 ,
This typically occurs because the PAC M580 doesn't have time to synchronize task data.
The MAST_SYNCHRONIZED, FAST_SYNCHRONIZED, and SAFE_SYNCHRONIZED variables indicate whether the database exchange between the Primary and Standby PACs was successful.
If not, the task cycle time must be increased:
MAST MAST task period %SW0 > Last cycle execution time (in ms) %SW30
FAST FAST task period %SW1 > Last cycle execution time (in ms) %SW33
SAFE SAFE task period %SW4 > Last cycle execution time (in ms) %SW42
Configuring MAST/FAST Tasks
The duration of the Data Pack/Unpack process depends primarily on the number of DFB instances to be exchanged.
Data Pack/Unpack
Copies the values of all variables into memory blocks, preparing for the data transfer.
All allocated variables in one memory block.
All unallocated variables in one memory block.
One DFB instance in one memory block.
What happens when the Scan time is too short?
Situations that may affect this:
A large number of DFBs to perform Pack/Unpack takes longer (1 ms per 100 DFBs).
A MAST task period that is too short.
Solutions:
- Deselect DFBs to be swapped.
- Recalculate every cycle.
- Higher period.
I recommend that you review the following document, the Exchanging M580 Hot Standby Data section
Link copied. Please paste this link to share this article on your social media post.
Hello @the18 ,
This typically occurs because the PAC M580 doesn't have time to synchronize task data.
The MAST_SYNCHRONIZED, FAST_SYNCHRONIZED, and SAFE_SYNCHRONIZED variables indicate whether the database exchange between the Primary and Standby PACs was successful.
If not, the task cycle time must be increased:
MAST MAST task period %SW0 > Last cycle execution time (in ms) %SW30
FAST FAST task period %SW1 > Last cycle execution time (in ms) %SW33
SAFE SAFE task period %SW4 > Last cycle execution time (in ms) %SW42
Configuring MAST/FAST Tasks
The duration of the Data Pack/Unpack process depends primarily on the number of DFB instances to be exchanged.
Data Pack/Unpack
Copies the values of all variables into memory blocks, preparing for the data transfer.
All allocated variables in one memory block.
All unallocated variables in one memory block.
One DFB instance in one memory block.
What happens when the Scan time is too short?
Situations that may affect this:
A large number of DFBs to perform Pack/Unpack takes longer (1 ms per 100 DFBs).
A MAST task period that is too short.
Solutions:
- Deselect DFBs to be swapped.
- Recalculate every cycle.
- Higher period.
I recommend that you review the following document, the Exchanging M580 Hot Standby Data section
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