Siemens 6ES7313-1AD03-0AB0 SIMATIC S7-300 CPU

Siemens 6ES7313-1AD03-0AB0 SIMATIC S7-300 CPU 313

Product Introduction

The Siemens 6ES7313-1AD03-0AB0 is a standard CPU from the SIMATIC S7-300 family. This CPU 313 module comes with a built-in 24V DC power supply. It offers 12KB of working memory for small to medium automation tasks. Many engineers select this Siemens controller for cost-effective solutions. The unit operates with STEP 7 V5.0 or higher and supports both battery-backed and battery-free data retention.

Technical Specifications

• Rated voltage (DC): 24 V (range 20.4V to 28.8V)

• Typical power loss: 8 W

• Inrush current (typ.): 8 A

• Work memory: 12 kbyte (12 KB / 4K instructions RAM)

• Load memory (integrated RAM): 20 kbyte

• Load memory (expandable FEPROM): max. 4 Mbyte

• Bit operation time (typ.): 0.6 µs (max. 1.2 µs)

• Word operation time (typ.): 2 µs

• Fixed-point arithmetic (typ.): 3 µs

• Floating-point arithmetic (typ.): 60 µs

Furthermore, this CPU 313 handles timer and counter operations in 15 µs typically. The processing speeds suit many real-time control applications.

Memory and Data Retention

Data backup options

• With battery: All blocks remain intact

• Without battery: 72 bytes of memory bits, timers, counters, and data stay saved

Work memory is non-expandable at 12KB. However, you can expand the load memory using a Flash-EPROM card up to 4MB. The integrated RAM provides another 20KB for temporary storage.

Moreover, the CPU supports up to 127 DBs, 128 FBs, and 128 FCs. Each block can be as large as 8 kbyte. The total number of S7 counters is 64 (counting range 1-999), and S7 timers total 128 (range 10 ms to 9,990 s).

Data Areas and Retentivity

• Flag memory: max. 256 byte (MB 0 to MB 255)

• Retentive without battery: 0 to 576 bits (M 0.0 to M 71.7, adjustable)

• Retentive with battery: 0 to 576 bits (adjustable)

• I/O address area: 128 kbyte each for inputs and outputs

• Process image: 32 bytes each for inputs and outputs

• Digital channels: 256 inputs, 256 outputs (total)

• Analog channels: 64 inputs, 32 outputs

Therefore, the Siemens 6ES7313-1AD03-0AB0 provides sufficient I/O addressing for many small machines.

Hardware Configuration Limits

Please note the following restrictions:

• Number of expansion units: 0 (no rack expansion)

• Maximum racks: 1

• Modules per rack: max. 8

• DP masters: via CP only (e.g., CP 342-5)

• Connectable programming devices: PGs/PCs with STEP 7 via MPI

Additionally, the CPU supports up to 32 nodes on the MPI bus. Each CPU allows 4 static and 4 dynamic connections total.

Interface and Communication

MPI Interface (RS485)

• Cable length without repeater: 50 m

• Cable length with 2 repeaters: 1,100 m

• Cable length with 10 repeaters in series: 9,100 m

• Fiber optic option: up to 23.8 km (with 16 star hubs or OLMs)

• Transmission rate: max. 187.5 kbit/s

Supported services

• PG/OP communication: Yes

• Global data communication: Yes

• S7 basic communication: Yes

• S7 communication (as server): Yes

Specifically, this CPU 313 works as an S7 communication server. You can connect operator panels, programming devices, and other S7 controllers through the MPI network.

Software and Programming

• Configuration software: STEP 7 V5.0 or higher

• Command set: Binary logic, bracketed operations, counting, loading, transferring, comparing, shifting, rotating, fixed and floating-point arithmetic, jump functions

• Nesting levels: 8

• Program organization: Linear or structured

• System functions (SFC): Interrupt/error processing, copy data, clock functions, diagnostic functions, module parameterization, operating mode transitions

• System function blocks (SFB): Yes

• Programming language options: SCL (optional)

• Know-how protection: User program password protection

Moreover, the CPU includes cycle time monitoring. The upper limit is adjustable from 1 ms to 6,000 ms, with a preset of 150 ms.

Mechanical & Environmental Parameters

• Dimensions (W x H x D): 80 mm x 125 mm x 130 mm

• Weight: approx. 530 g (memory card adds 16 g)

• Software clock: Yes (no hardware clock)

• Clock deviation: Not specified for this model

Furthermore, this module installs on a standard 35mm DIN rail. It requires no external cooling fan.

Installation Guidelines

First, turn off the 24V DC power supply before handling the CPU 313. Next, snap the Siemens 6ES7313-1AD03-0AB0 onto a 35mm DIN rail. Then, connect the power wiring to the integrated supply terminals. After that, insert a Flash-EPROM card if you need additional load memory. Additionally, install a backup battery if full data retention is required. Finally, connect a programming device via the MPI port and download your STEP 7 program.

For a spare part replacement, remove the old CPU first. Insert the 6ES7313-1AD03-0AB0 in the same slot. If you used battery-backed data, transfer the battery to the new unit. Power on and verify operation.

Packaging List

• 1 x Siemens 6ES7313-1AD03-0AB0 CPU 313 module

• 1 x Front connector (screw-type)

• 1 x Labeling strip

• 1 x Bus connector cover

Note: Battery and Flash-EPROM card are not included. No certificate or warranty document is included in the package.

Shipping Methods

We ship exclusively via FedEx, UPS, or DHL. Tracking numbers will be provided within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. Can the Siemens 6ES7313-1AD03-0AB0 operate without a backup battery?
Yes, this CPU 313 retains 72 bytes of data (memory bits, timers, counters) without a battery. However, for full block retention (DBs, FBs, FCs, OBs), you need a battery installed.

2. What is the maximum program size this CPU can handle?
The work memory is 12KB (equivalent to about 4K instructions). For larger programs, consider the CPU 314 or higher. Load memory can be expanded to 4MB via FEPROM.

3. Can I connect expansion racks to the 6ES7313-1AD03-0AB0?
No, this CPU supports only one rack with up to 8 modules. It has no integrated DP master. Use a CP 342-5 module to connect DP slaves.

4. How do I retain data during a power outage longer than the battery life?
Use the Flash-EPROM load memory option. The FEPROM card stores your program permanently. For retentive data without battery, use the 72-byte battery-free area (M bits 0.0 to 71.7).

5. What is the maximum cable length for the MPI interface?
Without a repeater, the maximum MPI cable length is 50 m. With two repeaters, you can reach 1,100 m. Using fiber optic cables and OLMs, the distance extends to 23.8 km.