FPΣ User's Manual
8.7 PLC Link
243
8.7.7.2 Error Detection Time for Transmission Assurance Relays
If the power supply of any given PLC fails or is turned off, it takes (as a default value) 6.4
seconds for the transmission assurance relay of that PLC to be turned off at the other
stations. This time period can be shortened using the SYS1 instruction.
EXAMPLE
Set SYS1 to change the time that the PLC link transmission assurance is off from the
default value of 6.4s to 100ms.
LD Body
NOTE
• The setting should not be changed as long as a longer transmission
assurance relay detection time does not cause any problems.
• The SYS1 instruction should be executed at the beginning of the program,
at the rise of R9014. The same waiting time should be set for all linked
PLCs.
• The time should be set to a value of at least twice the maximum
transmission cycle time when all of the PLCs are connected to the link.
• If a short time has been set, the transmission assurance relay may not
function properly. (The shortest time that can be set is 100ms.)
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