407
Input Circuit Schematics
• Resistance temperature detector (3-wire)
SoL
＋
－
Channel switching relay
Constant-current
circuit
Constant-current
circuit
SoL terminal is common
to all channels.
Analog input circuit: U8553, LR8533
• Voltage (100 mV f.s. to 2 V f.s. ranges)
＋
－
Channel switching relay
1 M
Ω
• Voltage (10 V f.s. to 100 V f.s. ranges)
＋
－
Channel switching relay
1 M
Ω
10 k
Ω
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