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Siemens 6ES7138-4DB03-0AB0 — PLC I/O & Expansion Modules

Siemens 6ES7138-4DB03-0AB0 ET200S Encoder Module, 1 DI, 24 V

MPN6ES7138-4DB03-0AB0

Siemens 6ES7138-4DB03-0AB0 ET200S encoder module, 1 digital input, 24 V DC, SSI / incremental, RS-422.

$398.15Ref. price · indicative, final on quote
Siemens 6ES7138-4DB03-0AB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7138-4DB03-0AB0 — I/O
ParameterValue
Digital inputs1
6ES7138-4DB03-0AB0 — Electrical
ParameterValue
Rated value (DC)24 V
Permissible range, lower limit (DC)20.4 V
Permissible range, upper limit (DC)28.8 V
For signal "1"+11 to +30V
For signal "0"-30 to +5 V
Current for signal "1" (typ.)9 mA
Power loss (typ.)1 W
Current consumption from load voltage L+ (no load), max.40 mA
Short-circuit protectionYes
Reverse polarity protectionYes
Isolation: channels to backplane busYes
Max. cable length, shielded50 m
6ES7138-4DB03-0AB0 — Performance
ParameterValue
Group fault indicator (SF, red LED)Yes
6ES7138-4DB03-0AB0 — Mechanical
ParameterValue
Height81 mm
Width15 mm
Depth52 mm
Weight (approx.)40 g

Product details

Encoder interface walkthrough

The 6ES7138-4DB03-0AB0: Short-circuit and reverse polarity protection are built in, and the module supports hot-swap (module exchange under process voltage). Galvanic isolation exists between channels and the backplane bus, but not between the channels and L+. The output voltage for the encoder is L+ minus 0.8 V, so account for a small drop when cabling to remote encoders. Draw up to 40 mA from L+ unloaded and 10 mA from backplane bus. Total dissipation 1 W typical.

Frequently asked questions

What supply voltage does this module require?

It operates on 24 V DC, with a permissible range from 20.4 V to 28.8 V DC. The load voltage L+ powers the encoder and the module electronics.

What cable length is supported for SSI encoders?

Up to 320 m at 125 kHz when using shielded cable. For incremental signals, the shielded cable limit is 50 m.

Can this module be swapped out while the system is powered?

Yes. The module supports exchange under process voltage (hot-swap), reducing downtime during replacement.

Does it provide isolation between channels and the backplane?

Yes, there is galvanic isolation between the channels and the backplane bus. However, there is no isolation between the channels and the load voltage L+.

MPN
6ES7138-4DB03-0AB0