Toshiba GR 200 Series, Instruction Manual

Page: 554 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 533 -
in the event suppression detector.
Event suppression
If the status of a device “chatters” for a short time, the SPOS function will receive iterative
signals from the device. Such iterative signals can cause extra burden for the SPOS function;
hence, event suppression can be required to reduce the additional burden created.
1 3 5 7
Signal
from device
On On On On On On On
On
2 4 6 8
On On On
[
SPOS-TELD
] [
SPOS-TELR
]
[
SPOS-NELD
]
Suppressed
signal
A
C
D
E B
Time.................
Figure 4.1-31 Iterative signals and signals suppressed
Figure 4.1-31 shows that the iterative signals received from the device have been
suppressed by the event suppression function. The suppression commences on receipt of the
seventh signal (at Time B). This is because the function can count the iterative number of
incoming signals. Detection commences at Time A, the setting [
SPOS-NELD
] is provided so
that the suppression commences at Time B. The setting [
SPOS-TELD
] is pertains to the
operation of the detection function from Time A (e.g., Time A to Time C).
The event suppression ceases when the iterative signals stop. The user can adjust the
point at which event suppression stops using the setting [
SPOS-TELR
]; as a result, no
suppressed signal is output after the end of the iterative signals (e.g., Time D to E).
To initiate event suppression the user should set
On
for scheme switch [
SPOS01-SPPEN
].
(ii) BO connection for
“Select command On/Off”
Figure 4.1-32 exemplifies the connection for the select command On and Off. Suppose that
connection with the BOs is achieved by the PLC function using connection point
“SPOS01_SL_BO_FLG”†; as a result, the “ Select command On” and the “Select command Off”
signals are issued at the BOI.