Siemens 6ES7216-2AD23-0XB0

CPU 226, DC/DC/DC, 24 DI / 16 DO

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Maker: Siemens
Part no.: 6ES7216-2AD23-0XB0
Serial / rev.: as printed on your unit

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Siemens SIMATIC S7-200 CPU 226 compact unit: 24 V DC supply, 24 DC inputs and 16 transistor outputs, 16/24 KB program and 10 KB data memory, two RS 485 ports.

Manufacturer: Siemens
Manufacturer part no.: 6ES7216-2AD23-0XB0
Product family: SIMATIC S7-200 Micro PLCs
Type: PLC CPU
Category: PLCs and I/O › CPU and processor modules
Lifecycle: Discontinued
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Siemens
Manufacturer part no.: 6ES7216-2AD23-0XB0
Type: PLC CPU
Application: Compact PLC
Used with: SIMATIC S7-200 (S7-22x expansion modules)
Rated value (DC) / 24 V DC: Yes
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 / Inrush current, max.: 10 A; at 28.8 V
Input current / from supply voltage L+, max.: 1 050 mA; 150 mA to 1 050 mA output current for expansion modules (5 V DC) 1 000 mA
24 V encoder supply / 24 V: Yes; permissible range: 15.4 to 28.8 V
24 V encoder supply / Short-circuit protection: Yes; electronic at 400 mA
24 V encoder supply / Output current, max.: 400 mA
Power loss, typ.: 11 W
Storage / Number of memory modules (optional): 1; pluggable memory module, content identical with integral EEPROM; can additionally store recipes, data logs and other files
Work memory / integrated (for program): 24 kbyte; 16 KB with active run-time edit
Work memory / integrated (for data): 10 kbyte
Backup / present: Yes; Program: Entire program maintenance-free on integral EEPROM, programmable via CPU; data: Entire DB 1 loaded from PG/PC maintenance- free on integral EEPROM, current values of DB 1 in RAM, retentive memory bits, timers, counters, etc. maintenance-free via high-performance capacitor; optional battery for long-term buffering
Backup battery / Backup time, max.: 100 h; (min. 70 h at 40 °C); 200 days (typ.) with optional battery module
CPU processing times / for bit operations, max.: 0.22 µs
S7 counter / Number: 256
S7 counter / Retentivity / adjustable: Yes; via high-performance capacitor or battery
S7 counter / Counting range / lower limit: 0
S7 counter / Counting range / upper limit: 32 767
S7 timer / Number: 256
S7 timer / Retentivity / adjustable: Yes; via high-performance capacitor or battery
S7 timer / Time range / lower limit: 1 ms
S7 timer / Time range / upper limit: 54 min; 4 timers: 1 ms to 30 s; 16 timers: 10 ms to 5 min; 236 timers: 100 ms to 54 min
Flag / Size, max.: 32 byte

Show all 110 specifications

Flag / Retentivity available: Yes; M 0.0 to M 31.7
Flag / of which retentive with battery: 0 to 255, via high-performance capacitor or battery, adjustable
Flag / of which retentive without battery: 0 to 112 in EEPROM, adjustable
Hardware configuration / Number of expansion units, max.: 7; Only expansion modules of the S7-22x series can be used. Due to the limited output current, the use of expansion modules may be limited.
Hardware configuration / connectable programming devices/PCs: SIMATIC PG/PC, standard PC
Expansion modules / Analog inputs/outputs, max.: 35; max. 28 inputs and 7 outputs (EM) or max. 0 inputs and 14 outputs (EM)
Expansion modules / Digital inputs/outputs, max.: 148; max. 128 inputs and 120 outputs (CPU+EM)
Expansion modules / AS-Interface inputs/outputs, max.: 62; AS-Interface A/B slaves (CP 243-2)
Number of digital inputs: 24
Digital inputs / Sourcing/sinking input: Yes; optionally, per group
Input voltage / Rated value (DC): 24 V
Input voltage / for signal "0": 0 to 5 V
Input voltage / for signal "1": min. 15 V
Input current / for signal "1", typ.: 2.5 mA
Input delay (for rated value of input voltage) / for standard inputs / parameterizable: Yes; all
Input delay (for rated value of input voltage) / for standard inputs / at "0" to "1", min.: 0.2 ms
Input delay (for rated value of input voltage) / for standard inputs / at "0" to "1", max.: 12.8 ms
Input delay (for rated value of input voltage) / for interrupt inputs / Parameterizable: Yes; I 0.0 to I 0.3
Input delay (for rated value of input voltage) / for technological functions / Parameterizable: Yes; (E 0.0 to E 1.5) 30 kHz
Digital inputs / Cable length / shielded, max.: 500 m; Standard input: 500 m, high-speed counters: 50 m
Digital inputs / Cable length / unshielded, max.: 300 m; not for high-speed signals
Number of digital outputs: 16; Transistor
Digital outputs / Short-circuit protection: No; to be provided externally
Digital outputs / Limitation of inductive shutdown voltage to: 1 W
Switching capacity of the outputs / with resistive load, max.: 0.75 A
Switching capacity of the outputs / on lamp load, max.: 5 W
Output voltage / for signal "1", min.: 20 V DC
Output current / for signal "1" rated value: 750 mA
Output current / for signal "0" residual current, max.: 10 µA
Output delay with resistive load / "0" to "1", max.: 15 µs; of the standard outputs, max. (Q 0.2 to Q 1.1) 2 µs; of the pulse outputs, max. (Q 0.0 to Q 0.1) 2 µs
Output delay with resistive load / "1" to "0", max.: 130 µs; of the standard outputs, max. (Q 0.2 to Q 1.1) 10 µs; of the pulse outputs, max. (Q 0.0 to Q 0.1) 10 µs
Parallel switching of two outputs / for uprating: Yes
Switching frequency / of the pulse outputs, with resistive load, max.: 20 kHz; Q0.0 to Q0.1
Total current of the outputs (per group) / all mounting positions / up to 40 °C, max.: 6 A
Total current of the outputs (per group) / horizontal installation / up to 55 °C, max.: 6 A
Relay outputs / Number of relay outputs: 0
Digital outputs / Cable length / shielded, max.: 500 m
Digital outputs / Cable length / unshielded, max.: 150 m
Number of analog potentiometers: 2; Analog potentiometer; resolution 8 bit
Connectable encoders / 2-wire sensor: Yes
Connectable encoders / 2-wire sensor / permissible quiescent current (2-wire sensor), max.: 1 mA
1. Interface / Interface type: Integrated RS 485 interface
Protocols / MPI: Yes; As MPI slave for data exchange with MPI masters (S7-300/S7-400 CPUs, OPs, TDs, Push Button Panels); S7-200-internal CPU/CPU communication is possible in the MPI network with restrictions; transmission rates: 19.2/187.5 kbit/s
Protocols / PPI: Yes; with PPI protocol for program functions, HMI functions (TD 200, OP), S7- 200-internal CPU/CPU communication ; transmission rates 9.6/19.2/187.5 kbit/s
Protocols / serial data exchange: Yes; As freely programmable interface with interrupt facility for serial data exchange with third-party devices with ASCII protocol transfer rates: 1.2 / 2.4 / 4.8 / 9.6 / 19.2 / 38.4 / 57.6 / 115.2 kbps; the PC/PPI cable can also be used as RS 232/RS 485 converter
MPI / Transmission rate, min.: 19.2 kbit/s
MPI / Transmission rate, max.: 187.5 kbit/s
2. Interface / Interface type: Integrated RS 485 interface
Counter / Number of counters: 6; High-speed counters (30 kHz each), 32 bit (incl. sign), can be used as up/down counters or for connecting 2 incremental encoders with 2 pulse trains offset by 90° (max. 20 kHz (A/B counters)); parameterizable enable and reset input; interrupt facilities (incl. call of subroutine with any content) when the setpoint is reached; reversal in counting direction, etc.
Counter / Counting frequency, max.: 30 kHz
Integrated Functions / Number of alarm inputs: 4; 4 rising edges and/or 4 falling edges
Integrated Functions / Number of pulse outputs: 2; High-speed outputs, 20 kHz, with interrupt option; pulse-width and frequency modulation option
Integrated Functions / Limit frequency (pulse): 20 kHz
Potential separation digital inputs / between the channels: Yes
Potential separation digital inputs / between the channels, in groups of: 13 and 11
Potential separation digital outputs / between the channels: Yes; Optocoupler
Potential separation digital outputs / between the channels, in groups of: 8 and 8
Permissible potential difference / between different circuits: 500 V DC between 24 V DC and 5 V DC
IP degree of protection: IP20
Ambient temperature during operation / horizontal installation, min.: 0 °C
Ambient temperature during operation / horizontal installation, max.: 55 °C
Ambient temperature during operation / vertical installation, min.: 0 °C
Ambient temperature during operation / vertical installation, max.: 45 °C
Air pressure acc. to IEC 60068-2-13 / permissible range, lower limit: 860 hPa
Air pressure acc. to IEC 60068-2-13 / permissible range, upper limit: 1 080 hPa
Relative humidity / Operation, min.: 5 %
Relative humidity / Operation, max.: 95 %; RH class 2 in accordance with IEC 1131-2
Programming / Command set: Bit logic instructions, compare instructions, timer instructions, counter instructions, clock instructions, transmissions instructions, table instructions, logic instructions, shift and rotate instructions, conversion instructions, program control instructions, interrupt and communications instructions, logic stack instructions, integer maths, floating-point math instructions, numerical functions
Programming / Program processing: free cycle (OB 1), interrupt-controller, time-controlled (1 to 255 ms)
Programming / Program organization: 1 OB, 1 DB, 1 SDB subroutines with/without parameter transfer
Programming / Number of subroutines, max.: 64
Programming / Programming language / LAD: Yes
Programming / Programming language / FBD: Yes
Programming / Programming language / STL: Yes
Know-how protection / User program protection/password protection: Yes; 3-stage password protection
Plug-in I/O terminals: Yes
Width: 196 mm
Height: 80 mm
Depth: 62 mm
Weight, approx.: 550 g

Technical documents (1)

Siemens data sheet 6ES7216-2AD23-0XB0

Key features

24 digital inputs and 16 transistor outputs, 24 V DC
24 KB program memory (16 KB with run-time edit), 10 KB data
Up to 7 S7-22x expansion modules
Two RS 485 ports for PPI and free serial protocols
Cancelled by Siemens on 1 October 2017, discontinued on 1 November 2025; listed as a spare part

About the Siemens 6ES7216-2AD23-0XB0

The Siemens 6ES7216-2AD23-0XB0 is the CPU 226 in its DC version, the larger of the two S7-200 CPUs here: 24 inputs and 16 transistor outputs against the CPU 224's 14 and 10, more memory and a second RS 485 port. Siemens's data sheet gives 24 KB program memory (16 KB with run-time edit), 10 KB data memory, up to 7 expansion modules and a 24 V DC supply. SiePortal shows the product cancellation on 1 October 2017 and the product discontinued on 1 November 2025; Siemens still lists it as a spare part.

What is the 6ES7216-2AD23-0XB0 used for?

It is the controller of a machine that needs more I/O than a CPU 224: program, inputs and outputs in one unit, with expansion modules alongside.

Lifecycle and successor

Discontinued.

Before you order

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

Check the full order number on the front label. CPU 226 units come with different supplies and output types; this order number is the 24 V DC version with transistor outputs.

Other parts in the Siemens SIMATIC S7-200 family

Listed for reference. They differ from the 6ES7216-2AD23-0XB0 in rating, supply, interface or function and are not interchangeable with it unless Siemens says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Siemens 6ES7214-1AD23-0XB0CPU 224, DC/DC/DC, 14 DI / 10 DO	PLC CPU	Discontinued	On Request	On request	View
Siemens 6ES7223-1BL22-0XA0EM 223 digital I/O, 16 DI / 16 DO, 24 V DC	Digital I/O module	Discontinued	On Request	On request	View
Siemens 6ES7231-0HC22-0XA0EM 231 analog input, 4 AI, 12 bit	Analog input module	Discontinued	On Request	On request	View

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