Input Disconnection Detected; Input Error Detection - Omron CJ Series Operation Manual

1-2-10 Input Disconnection Detected

Sensor disconnections can be detected for thermocouple input and resistance thermometer input.
When a disconnection occurs, Input Error in the Operation Data becomes 1.
Either the high (115%) or low (−15%) direction can be specified for when a disconnection is detected.
Applicable Units
Analog I/O Unit
Disconnection
Detection Flag
The following applies for the CJ1W-AD04U.
• Temperature input
High: Upper limit of temperature input range +20°C or +20°F
Low: Lower limit of temperature input range −20°C or −20°F
• Voltage/current input (limited to input of 1 to 5 V and 4 to 20 mA)
High: 105%
Low: −5%

1-2-11 Input Error Detection

An errors resulting from exceeding the high or low limits can be detected.
When an input error occurs, Input Error in the Operation Data becomes 1.
Applicable Units
An input error will be detected for CJ1W-PDC15 only when an external power supply is used and only in
a range of 4 to 20 mA and 1 to 5 V.
When an external power supply is not used, Input Error in the Operation Data becomes 1.
The following applies for the CJ1W-AD04U.
With thermocouple and platinum resistance thermometer inputs, an input error is detected if the tem-
perature exceeds the high or low limit of the sensor range by 20°C or 20°F.
With voltage and current inputs, an error is detected only for the following values in the 1 to 5 V and 4 to
20 mA ranges:
• 1 to 5 V range: Converted AD value < 0.3 V
• 4 to 20 mA range: Converted AD value < 1.2 mA
CJ-series Analog I/O Units Operation Manual for NJ-series CPU Unit(W498)
Isolated-type Universal Input Units
CPU Unit
Process value
High/low designation:
115% or −15%
Isolated-type Direct Current Input Unit
Isolated-type Universal Input Units
1 Overview and Features
CJ1W-AD04U
CJ1W-PH41U
CJ1W-PDC15
CJ1W-AD04U
CJ1W-PH41U
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