Siemens 6ES7338-4BC01-0AB0

Technical specifications

Manufacturer

Siemens

Manufacturer part no.

6ES7338-4BC01-0AB0

Type

Position input module

Application

Position input module

Used with

SIMATIC S7-300 rack (S7-300 backplane bus)

Load voltage L+ / Rated value (DC)

24 V

Load voltage L+ / permissible range, lower limit (DC)

20.4 V

Load voltage L+ / permissible range, upper limit (DC)

28.8 V

Input current / from load voltage L+ (without load), max.

100 mA

Input current / from backplane bus 5 V DC, max.

160 mA

24 V encoder supply / 24 V

Yes; L+ (-0.8 V)

24 V encoder supply / Output current, max.

900 mA

Power loss, typ.

3 W

Input voltage / for signal "0"

-3 to +5V

Input voltage / for signal "1"

11 to 30.2 V

Input current / for signal "0", max. (permissible quiescent current)

2 mA

Input current / for signal "1", typ.

9 mA

Input delay (for rated value of input voltage) / for standard inputs / at "0" to "1", min.

300 µs

Cable length / shielded, max.

600 m

Number of connectable encoders, max.

3

Connectable encoders / Absolute encoder (SSI)

Yes

Connectable encoders / 2-wire sensor

Yes

Encoder signals, absolute encoder (SSI) / Cable length, shielded, max.

320 m; 320 m at 125 kHz; 160 m at 250 kHz; 60 m at 500 kHz; 20 m at 1 MHz

Alarms / Diagnostic alarm

Yes

required front connector

20-pin

Technical documents (1)

• Siemens data sheet 6ES7338-4BC01-0AB0

Key features

• Reads the position value from up to 3 SSI absolute encoders
• 2 FREEZE digital inputs
• 24 V encoder supply, up to 900 mA
• Encoder cable up to 320 m at 125 kHz
• Discontinued by Siemens on 1 October 2025; spare part only

About the Siemens 6ES7338-4BC01-0AB0

The Siemens 6ES7338-4BC01-0AB0 is the SM 338, the S7-300 module that reads absolute position values from SSI encoders. Siemens's data sheet gives up to 3 encoders, 2 FREEZE inputs, a 24 V encoder supply of up to 900 mA, and encoder cables of up to 320 m at 125 kHz (shorter at higher clock rates). It supports isochronous mode and takes a 20-pin front connector. Siemens's data sheet marks it as a spare part.

What is the 6ES7338-4BC01-0AB0 used for?

It gives an S7-300 CPU the absolute position of axes from SSI encoders.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check the order number on the module and list the encoders connected to it when asking for a quote.