Siemens Simatic S7-1500 Manual - Page 16

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Wiring

4.1 Terminal assignment

24 V DC supply voltage

The following table shows the signal names and the descriptions of the terminal assignment

for a 24 V DC supply voltage.

Table 4- 1

1L+ and 2L+ as well as 1M and 2M are bridged internally

Maximum 10 A permitted

The length of the connectable 24 V DC supply cable is limited to max. 30 m for EMC reasons.

USB 3.1 interface

The USB 3.1 interface is designed with a type A connection socket. The plug connector does

not have a strain relief. You should therefore use a cable tie for strain relief of the USB cable.

Use a 2.5 mm wide cable tie for strain relief.

The figure below shows the TM NPU with installed cable tie.

Figure 4-2

Only connect sensors and cables to the USB interface in which the shield and ground signal

are galvanically isolated.

For sensors and cables whose shield and ground (PIN 4) are connected to each other, an

impermissible current flows over the cable shield in the event of a ground fault of the

24 V DC supply. The impermissible current flows over the shield spring of the module and the

grounded mounting rail.

Terminal assignment 24 V DC supply voltage

View

Signal name

1L+

2L+

Strain relief for USB cable

24 V DC

24 V DC (for looping through)

Ground

Ground (for looping through)

Equipment Manual, 09/2020, A5E46384784-AA

Description

Technology Module TM NPU