Siemens SIMATIC ET 200AL System Manual page 483

Wiring
3.1 Terminal and block diagram
The figure below shows an example of the pin assignment for voltage measurement and
current measurement.
①
Voltage measurement
②
Current measurement
③
Current measurement (2 DMU)
④
Current measurement (4 DMU)
⑤
Multiplexer
⑥
Analog-to-digital converter (ADC)
⑦
Microcontroller
⑧
ET-Connection interface
⑨
Internal supply voltage
X10 to X13 Channels 0 to 3
X80 Infeed of supply voltages
X81 Loop-through of supply voltages
Image 3-1 Terminal and block diagram for voltage and current measurement
Analog input module AI 4xU/I/RTD 4xM12 (6ES7144-5KD00-0BA0)
Manual, 03/2016, A5E32350124-AC
X30 Infeed of the ET-Connection
X31 Loop-through of the ET-Connection
1L+ Supply voltage 1L+ (non-switched)
1M Ground 1M (non-switched)
2L+ Load voltage 2L+ (switched)
2M Ground 2M (switched)
M + Measuring input positive, channel n
n
M - Measuring input negative, channel n
n
U 24 V encoder supply
V
AI LEDs channel status (0, 1, 2 and 3) (green)
DIAG LED diagnostic status (red/green)
3
13