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Functions and Programming
Limit Warning Flags
2-3-9 Input Disconnection Detection Function
Function
Input Disconnect Flags
28
DM word
m+33
Input 3 upper-limit value
m+34
Input 4 lower-limit value
m+35
Input 4 upper-limit value
m+36
Input 5 lower-limit value
m+37
Input 5 upper-limit value
m+38
Input 6 lower-limit value
m+39
Input 6 upper-limit value
m+40
Input 7 lower-limit value
m+41
Input 7 upper-limit value
m+42
Input 8 lower-limit value
m+43
Input 8 upper-limit value
If the conversion data type setting (bit 08 of DM m) is binary, the output value
will be converted to BCD for comparison.
When the input signal range is set to –10 to +10 V, calculate the input data
with –10 V as 0000 and +10 V as 4000. (When the scaling function is being
used, –10 V=lower-limit value and +10 V=upper-limit value.)
The corresponding Limit Warning Flag (bits 08 to 15 in IR n+9) will be turned ON
if the output data in IR words n+1 through n+8 isn't within the range specified with
the upper-/lower-limit values. The Limit Warning Flags don't indicate whether
the upper or lower limit has been crossed.
IR (n + 9)
Note
1. The Limit Warning Flag won't be turned ON if the output data is outside of the
specified range for less than one PC cycle.
2. The limit warning function won't operate if the upper-/lower-limit values are
outside of the acceptable setting range (0000 to 4000) or the lower-limit val-
ue is greater than the upper-limit value.
The Input Disconnect Flag (bits 00 through 07 of IR n+9) will be turned ON when
the input signal level is less than 1 V/4 mA and the input signal range is set at 1 to
5 V/4 to 20 mA. The BROKEN WIRE indicator on the front of the Unit will light
when one or more of the Input Disconnect Flags is ON.
The Input Disconnect Flags are contained in in word IR n+9, as shown below.
IR (n + 9)
Data
Bit 15
14
13
12
Bit 07
06
05
04
Section 2-3
11
10
09
08
03
02
01
00
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