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■ Slave abnormal detection method –2: the case necessary of HOLD function
In the case of setting HOLD function turning on, there is no guarantee that the input from slave is turned off
with time-out error. Please control one point of the transistor output in slave station with the clock of one second,
etc as shown in Figure 6.4. And please wire this output signal to input in salve station, and the ladder program
detects normality whether changing ON/OFF continues.
R7E7
Clock of one second
X10000
X11000
SS7
SS8
M200
M201
Slave St.No.0
Slave St.No.1
normal
Figure 6.4 Slave abnormal detection method –2 (the case necessary of HOLD function)
Master module
(EH-TRMME)
X
16
Program example detecting both of salve normality
normal
Chapter 6
Error indication and Countermeasure
Slave St.No.0
(EH-TRMLE)
X
Y
16
16
Return clock from
Y10200 to X10000
Y10200
Y11100
SS7
0.1s×15
SS8
0.1s×15
M200
Slave St. No.0
normal
Use transistor type output module for
M201
output with clock of one second in
slave station. If the relay output module
Slave St. No.1
is used, the product-life cycle is
normal
exhausted at once because the opening
M202
and shutting frequency is large.
Both of slave
normal
6 – 5
Slave St.No.1
(EH-TRMLE)
X
Y
X
X
Y
16
16
16
16
16
Return clock from
Y11100 to X11000
If changing X10000 stops for
1.5 seconds or more, the point
of contact of SS is turned off
because the edge start doesn't
hang to the single shot timer.
If changing X11000 stops for
1.5 seconds or more, the point
of contact of SS is turned off
because the edge start doesn't
hang to the single shot timer.
CAUTION
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