Characteristics

• 8 inputs
• Channels electrically isolated from each other and from the backplane bus
• 8 process input words, 8 process output words (for temperature compensation)
• Measuring range: ±80 mV
• Supported thermocouples: E, J, K, N, R, S, T, B, C, L
• Measurement resolution: up to 15 bits + sign
• External or internal temperature compensation
• Diagnostic messages
• Limit value alarms for each channel
• A bi-color LED (blue/red) indicates the module’s operating status and any malfunctions
• Red/green bi-color LEDs (one for each channel) indicate the channels` states

Parameters for the module

• Diagnostic alarm: On | Off
• Overflow / underflow diagnosis: On | Off
• Representation values: SIMATIC* S7 | SIMATIC* S5 (for ±80 mV only)
• Temperature unit: Celsius x 10 | Fahrenheit x 10 | Kelvin x 10

Parameters for each channel

• Wire break detection: On | Off
• Interference frequency suppression: None | 10 Hz | 50 Hz | 60 Hz | 400 Hz
• Measuring ranges: ±80 mV 
• Thermocouples: E | J | K | N | R | S | T | B | C | L
• Temperature compensation:Internal | External | Process data-based
• Limit value alarms enabled: On | Off
• Upper/lower limit: 16-bit analog value (±27648)

Channel LED signals

Flashing red light Parameter assignment error on channel
Solid red light         Reading overflow/underflow or wire break
Flashing green light Reading within overrange
Solid green light         Channel configured, normal reading
Off                                 Channel disabled or module not yet configured

Orderdata

Product	Ordernumber
Analog input module - AI 8 x TC, Iso., 16 Bit	600-254-4AH22

* SIMATIC is a registered trademark of Siemens AG.