Requirement Of Power Sequence In Main Unit And Expansion Unit/Module - FATEK FBs Series User Manual

5.4 Requirement of Power Sequence in Main Unit & Expansion Unit/Module
When the power is on, the FB
its expansion interface and get the actual I/O configuration. Therefore, while the main unit performs detection, the
power in expansion unit/module should be already UP, otherwise, the detected I/O configuration will not correct.
Namely, the power of expansion unit/module should be ON simultaneously or even earlier. There will be no time
sequence error when main unit/expansion unit/module are connected together to one power. If the expansion unit and
main unit powered by different powers (or the same power but different switches), or external power supply is used for
expansion modules, time sequence of both powers should be considered. To solve the problem of the expansion
unit/module power not get ready before main unit power does, FB
delay the detection time of I/O configuration. The time base of R4150 is 0.01sec with a default value of 100 (namely a
1sec delay), which can be set from 100~500 (1~5sec), as shown in the figure below. If the expansion unit power cannot
be UP within 1sec after main unit power is ON, the R4150 time needs to be set longer to delay the detection by CPU. It
cannot exceed 5sec, however, otherwise the configuration of expansion interface cannot be detected.
擴充機(模組)電源
-PLC main unit first detects the type and number of expansion unit/module attached to
S
0
秒
s e c
Main Unit Power 主機電源
Expansion Unit
(Module) Power
無需調整
No adjustment
required
-PLC provides a special R4150 register which can
S
1 5
秒 秒
s e c
s e c
需調整 R4150
Adjustment
requiredR4150
H5-9
無法偵測
Unable to detect