The Siemens 6ES7518-4AP00-0AB0 is the CPU 1518-4 PN/DP central processing unit from the SIMATIC S7-1500 standard automation family. The CPU includes three PROFINET interfaces (one with a 2-port switch supporting IRT, two for general communication) and one PROFIBUS DP master interface.
Item No :
6ES7518-4AP00-0AB0Order(MOQ) :
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EXWProduct Origin :
GermanyShipping Port :
WuhanLead Time :
3~5 daysWeight :
3kg| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7518-4AP00-0AB0 |
| Product Family | SIMATIC S7-1500 |
| Product Type | CPU 1518-4 PN/DP Central Processing Unit |
| Work Memory | 6 MB for program; 60 MB for data |
| Load Memory | SIMATIC Memory Card, max. 32 GB (required) |
| Processing Times | Bit: 1 ns; Word: 2 ns; Fixed-point: 2 ns; Floating-point: 6 ns |
| Interfaces | 3 x PROFINET (X1 with 2-port switch, X2, X3); 1 x PROFIBUS DP |
| PROFINET IO Controller | Yes; up to 512 IO devices (64 in IRT mode) |
| PROFIBUS DP | DP Master only (cannot be DP Slave) |
| Supply Voltage | 24 V DC (19.2 – 28.8 V) |
| Current Consumption | 1.55 A rated; 2.4 A max. |
| Power Loss | Typ. 24 W |
| Dimensions | 175 mm x 147 mm x 129 mm |
| Weight | Approx. 1,988 g |
| Engineering Software | STEP 7 TIA Portal (see Siemens entry ID 109746275 for minimum version) |
| Model | Description | Typical Application |
|---|---|---|
| 6ES7518-4AP00-0AB0 (this model) | CPU 1518-4 PN/DP, 6 MB/60 MB | Highest-performance standard automation |
| 6ES7517-3AP00-0AB0 | CPU 1517-3 PN/DP, 2 MB/8 MB | Mid-high performance standard automation |
| 6ES7518-4AX00-1AC0 | CPU 1518-4 PN/DP MFP + C/C++ RT + OPC UA | High-level applications with C/C++ runtime |
| 6ES7516-3AP03-0AB0 | CPU 1516-3 PN/DP, 2 MB/7.5 MB | Mid-range standard automation |
| 6ES7515-2AM02-0AB0 | CPU 1515-2 PN, 500 KB/3 MB | Compact standard automation |
| 6ES7954-8Lxxxx-0AA0 | SIMATIC Memory Card | Required for CPU operation |
Q1: What is the primary function of the 6ES7518-4AP00-0AB0?
It is the highest-performance standard CPU in the SIMATIC S7-1500 family. It executes user programs, manages I/O communication via three PROFINET interfaces and one PROFIBUS DP master interface, and provides extensive diagnostic capabilities. It is designed for complex machine and plant automation requiring large memory and fast processing speed.
Q2: Does this CPU require a SIMATIC Memory Card?
Yes. The CPU 1518-4 PN/DP requires a SIMATIC Memory Card for operation. The card serves as the load memory and is essential for program storage and data management. Maximum supported capacity is 32 GB.
Q3: What are the key differences between the three PROFINET interfaces?
X1: Features an integrated 2-port switch and supports PROFINET IO RT and IRT (isochronous real-time). It can be used as a PROFINET IO Controller and/or IO Device. MRP ring configuration is only possible on X1 ports.
X2 and X3: Support PROFINET basic functionality for HMI communication, programming, and connection to higher-level networks. They do not support IO Controller/IO Device roles. X3 supports 1000 Mbps transmission rate for firmware V1.7 and higher.
Q4: Can this CPU be used in redundant (H) systems?
No. The 6ES7518-4AP00-0AB0 is a standard (non-redundant) CPU. For redundant high-availability applications, the S7-1500H system with CPUs such as the CPU 1517H-3 PN (6ES7517-3HP00-0AB0) or CPU 1518HF-4 PN (6ES7518-4JP00-0AB0) is required.
Q5: What are the common causes of CPU failing to enter RUN mode?
Common causes include:
Mode selector switch issue: The physical switch may be stuck in STOP position despite appearing to be in RUN. The diagnostic buffer will report "Mode selector switch in STOP position".
MMC incompatibility: Firmware V2.6 and later cannot initialize on 24 MB MMC cards. The CPU will briefly flash the RUN/STOP LED, then remain in STOP with a "No project on MMC" error. Use a larger capacity card (e.g., 256 MB or higher).
Firmware/configuration mismatch: Ensure the TIA Portal project matches the actual CPU firmware version.
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