Connection Examples; 750-464 (Rtd) Version, 4-Channel Operation; X 2-Wire; Special Features In 4-Channel Operation - WAGO -I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-464 2/4 AI RTD configurable
6.2

Connection Examples

Use shielded signal lines!
Only use shielded signal lines for analog signals and I/O modules which are
equipped with shield clamps. Only then can you ensure that the accuracy and
interference immunity specified for the respective I/O module can be achieved
even in the presence of interference acting on the signal cable.
6.2.1

750-464 (RTD) Version, 4-Channel Operation

6.2.1.1

4 x 2-Wire

Important information for 4-channel operation
Please note the special features of 4-channel operation in the following chapter!

Figure 10: Connection example, version 750-464 (RTD), 4-channel, 4 x 2-wire

6.2.1.2

Special Features in 4-Channel Operation

6.2.1.2.1 Open Input Wiring

The resistors and/or temperature sensors connected to the bus terminal are
metered sequentially (channel 1, channel 3, channel 2, channel 4). In so doing,
channel 1 and channel 3, or channel 2 and channel 4 form a common measuring
circuit in the circuit design. Therefore, in 4-channel operation, either both
channels of a measuring circuit have to be connected or unused channels have
to be connected at a resistance of 0 Ω ... 5 kΩ.
Connect Devices 73
Manual
Version 1.1.0