202
(4) CH Difference conversion reference value
The digital operation value at the start of the difference conversion is stored as signed 16-bit binary as the
difference conversion reference value.
● The difference conversion reference value is updated when CH Difference conversion trigger (RY14 to RY17, RY24 to
RY27) is turned from No request (OFF) to Trigger request (ON).
● Even if CH Difference conversion state flag (RX14 to RX17, RY24 to RY27) is turned from Converting difference (ON)
to Not converted (OFF), CH Difference conversion reference value (RWr6 to RWr9, RWr16 to RWr19) is not cleared.
For the difference conversion function, refer to the following:
• Difference Conversion Function ( Page 122, Section 8.14)
(a) Device number
The device numbers of this remote register are as follows:
(5) Input signal error detection flag
Input signal status can be checked with this flag for each channel.
(a) The state of Input signal error detection flag
• When Input signal error detection setting (address: 0109H, 0209H) is set to Disconnection detection (4H),
the set channel is monitored to detect a disconnection. When the analog input value satisfies the
disconnection detection condition (2mA or 0.5V or less), the bit of the lower limit flag in the corresponding
channel turns to Alarm ON (1).
• With the input signal error detection function used, an error detected in any of the channels where A/D
conversion is set to be enabled results in Input signal error detection signal (RX1C, RX2C) being turned
on.
(b) Clearing Input signal error detection flag
• After the analog input value returns to a value that is larger than the criteria of disconnection detection
(2mA or lower or 0.5V or lower), turning on and off Error clear request flag (RYA) results in this flag being
cleared.
• Turning on and off Initial data setting request flag (RY9) results in this flag being cleared.
Remote register name
Main A/D converter module Extension A/D converter module
CH1 CH2 CH3 CH4 CH1 CH2 CH3 CH4
CH Difference conversion reference value RWr6 RWr7 RWr8 RWr9 RWr16 RWr17 RWr18 RWr19
00000000 0 0 0 0
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b0b1b2b3b4
CH4
Lower limit flag
CH3
Lower limit flag
CH2
Lower limit flag
CH1
Lower limit flag
0: Normal
1: Alarm On
The values of b8 to b15 are fixed to 0. b1, b3, b5, b7
The values of b0, b2, b4, and b6 are fixed to 0.
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