The Siemens 6ES7312-1AE14-0AB0 is a central processing unit designed for the versatile SIMATIC S7-300 system. This CPU 312 model provides a cost-effective solution for basic control tasks. It offers a robust integrated power supply that operates at 24 V DC. Furthermore, its compact design saves valuable space within the control cabinet.
This module’s hardware functional status is 01, and it runs firmware version V3.3. Engineering is easily performed using STEP 7 V5.5 + SP1 or higher. Alternatively, you can use STEP 7 V5.2 + SP1 with HSP 218. Its work memory is 32 KB, which is non-expandable. Therefore, you must use a Micro Memory Card (MMC) for program and data storage. The load memory supports MMCs up to 8 Mbyte. This ensures reliable data management for at least 10 years.
Power Supply and Consumption
The CPU’s rated supply voltage is 24 V DC. It tolerates a lower limit of 19.2 V and an upper limit of 28.8 V. For protection, we recommend a 2 A minimum external fuse for the power supply lines. The mains buffering time is 5 ms during a voltage failure. Its typical current consumption is 140 mA in no-load operation. However, the rated current consumption is 650 mA. Additionally, the typical inrush current is 3.5 A, with an I²t value of 1 A²·s. The typical power loss for this unit is only 4 W.
Memory and CPU Processing Times
The Siemens 6ES7312-1AE14-0AB0 includes 32 KB of integrated work memory. It supports a maximum of 1,024 blocks, including DBs, FCs, and FBs. This number can be reduced by the MMC used. Each DB, FB, FC, and OB can have a maximum size of 32 KB. The CPU processing times are fast and efficient. For instance, a bit operation takes only 0.1 µs. Meanwhile, a word operation completes in 0.24 µs. Fixed-point arithmetic takes 0.32 µs, while floating-point arithmetic takes 1.1 µs.
Counters, Timers, and Data Areas
The unit features 256 S7 counters and 256 S7 timers. Their retentivity is adjustable. It also supports IEC counters and timers via SFBs, which are unlimited. The maximum retentive data area is 32 KB. This includes timers, counters, and flags. The flag area is 256 bytes, with retentivity available for MB 0 to MB 255. Furthermore, the data blocks have adjustable retentivity.
Addressing and Interfaces
This controller handles an I/O address area of 1,024 bytes for both inputs and outputs. Its process image is also 1,024 bytes for inputs and outputs. For digital channels, it supports 256 inputs and 256 outputs centrally. For analog channels, it supports 64 inputs and 64 outputs centrally. Notably, the Siemens CPU 312 has one integrated RS 485 interface for MPI communication. The maximum transmission rate is 187.5 kbit/s. It supports PG/OP communication, global data, and S7 basic communication. However, it does not support routing.
Dimensions and Weight
The 6ES7312-1AE14-0AB0 has a compact width of 40 mm, a height of 125 mm, and a depth of 130 mm. The unit weighs approximately 270 g. This small footprint allows for easy integration into various panel layouts.
Ambient Conditions
During operation, the CPU supports an ambient temperature range from 0 °C to 60 °C. This ensures stable performance in typical industrial environments. Additionally, it has a software clock, though it is not buffered. The maximum deviation per day is 10 seconds, with a typical value of 2 seconds.
Hardware Setup
To begin, mount the CPU on a standard S7-300 rail. The maximum number of expansion units is 0. This means you can only use one rack with up to 8 modules. For more complex systems, you can add communication processors (CPs). This model can handle up to 4 CPs for LAN and 8 for PtP or FM. Remember to insert a Micro Memory Card into the slot before operation.
Communication and Connections
The CPU offers 6 total connections. These include 5 for PG communication and 5 for OP communication. Additionally, 2 connections are usable for S7 basic communication. The MPI interface supports PG/OP communication and global data. For S7 communication, the unit can only act as a server. It supports X_PUT and X_GET, with a user data size of 180 bytes per job. The maximum user data per consistent job is 240 bytes as a server.
Siemens 6ES7312-1AE14-0AB0 CPU Module (1 unit)
Front connector (1 unit)
Labeling strips (1 set)
Manual and documentation (on CD/DVD)
Shipping Method: Fedex, UPS, DHL
1. What type of memory card is required for the 6ES7312-1AE14-0AB0?
This CPU requires a SIMATIC Micro Memory Card (MMC) for its load memory. The maximum supported size is 8 Mbyte.
2. Can I expand the work memory on this CPU 312?
No, the 32 KB work memory on the Siemens S7-300 CPU is integrated and not expandable. Please plan your program size accordingly.
3. Is the real-time clock battery-backed on the 6ES7312-1AE14-0AB0?
No, the software clock is not buffered. However, it continues to run after a POWER-ON from the time it had before the power loss.
4. Which software is needed to program the 6ES7312-1AE14-0AB0?
You need STEP 7 V5.5 + SP1 or higher. You can also use STEP 7 V5.2 + SP1 with the appropriate HSP 218.
5. How many digital I/O modules can I connect to this CPU?
You can connect up to 256 digital inputs and 256 digital outputs. These are all central, as the maximum number of expansion units is 0.
| Brand Name | |
| Model No. | 6ES7312-1AE14-0AB0 |
| Product Type | Central Processing Unit |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
