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(5) CH Alert definition (RWr4 to RWr7)
Bits corresponding to alerts detected in each channel become 1.
Bit data b15 is
fixed to 0.
Target bit number
Flag name
b0
CH Input range upper limit
b1
CH Input range lower limit
b2
CH Process alarm upper limit
b3
CH Process alarm lower limit
b4
CH Rate alarm upper limit
b5
CH Rate alarm lower limit
(fixed to 0)
b6 to b7
b8
CH Alert 1
b9
CH Alert 2
b10
CH Alert 3
b11
CH Alert 4
(fixed to 0)
b12
CH Loop disconnection
b13
detection
(fixed to 0)
b14
b15
(fixed to 0)
*1
For the temperature measurement range, refer to the following.
Page 303, Appendix 2 (5) (a)
Bit data from b6 to b15 become Unused in the temperature input mode.
(a) Temperature measurement range
The temperature measurement range is as follows.
• (Input range lower limit - 5% of full scale) to (Input range upper limit + 5% of full scale)
Calculation for the case when CH Input range (address: 100H, 130H, 160H, 190H) is 38 and the
Ex.
temperature measurement range is -200.0 to 400.0
• Input range lower limit - 5% of full scale = -200 - ((400.0 - (-200.0)) 0.05) = -230.0
• Input range upper limit + 5% of full scale = 400 + ((400.0 - (-200.0)) 0.05) = 430.0
Therefore, the temperature measurement range is -230.0 to 430.0.
The temperature control module checks whether the input temperature is within temperature measurement
range of the input range. If the input temperature is out of the temperature measurement range, CH Input
range upper limit (b0 of RWr4 to RWr7) or CH Input range lower limit (b1 of RWr4 to RWr7) turns to 1 (ON).
The conditions which the temperature control module uses to judge whether the measured temperature is
within the temperature measurement range or not differ depending on the following settings.
• CH Stop mode setting (address: 118H, 148H, 178H, 1A8H) ( Page 336, Appendix 3 (27))
b15
b14
b13
b12
b11
b10
b9
0
Temperature process value (PV) has exceeded the temperature measurement range
input range.
Temperature process value (PV) has fallen below the temperature measurement range
input range.
Temperature process value (PV) has reached the process alarm upper upper limit value or more.
Temperature process value (PV) has reached the process alarm lower lower limit value or lower.
The variation of temperature process value (PV) has reached the rate alarm upper limit value or
more.
The variation of temperature process value (PV) has reached the rate alarm lower limit value or
lower.
(Unused)
Alert 1 has occurred. (Page 169, Section 8.3.11)
Alert 2 has occurred. (Page 169, Section 8.3.11)
Alert 3 has occurred. (Page 169, Section 8.3.11)
Alert 4 has occurred. (Page 169, Section 8.3.11)
(Unused)
Loop disconnection has been detected. (Page 212, Section 8.3.19)
(Unused)
(Unused)
Common
b8
b7
b6
b5
b4
b3
b2
0
0
Bit data from b6 to
b7 are fixed to 0.
Alert definition
APPENDICES
b1
b0
*1
of the set
*1
of the set
A
303
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Troubleshooting
