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Appendix 1 Details of Remote I/O Signals
Appendix 1.1 Remote input signals
(7) Alert output signal
Alert output signal (RX18, RX28) turns on at the detection of a process alarm.
(a) Process alarm
• The signal turns on when the digital operation value, in the channel where the alert output setting (process
alarm) is active and A/D conversion is enabled, exceeds the range set in CH1 Process alarm lower lower
limit value (address: 010FH, 020FH) to CH4 Process alarm upper upper limit value (address: 011EH,
021EH). In addition, the corresponding bit in Alert output flag (RWrB, RWr1B) turns to "1" and the ALM
LED of the main A/D converter module turns on.
• When the digital operation values for all the conversion-enabled channels are obtained within the setting
range, the corresponding values and status become as follows.
(b) Device number
The device numbers of this input signal are as follows:
Item Status
Latest warning code (RWr1) 0000H
Bit position corresponding to the channel relevant to Alert output flag
(RWrB, RWr1B)
OFF
Alert output signal (RX18, RX28) OFF
ALM LED of the main A/D converter module Lights out
Signal name Main A/D converter module Extension A/D converter module
Alert output signal RX18 RX28
Alert output flag
(RWrB, RWr1B)
Alert output signal
(RX18, RX28)
Alert (process alarm)
00
Controlled by the A/D converter module
ON
OFF
Controlled by the program
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