SIEMENS 6ES5470-8MB12
- EICHLER-art.no.: K0117588
- EAN: 4025515054269
Product description
SIMATIC S5, Analog output 470 Isolated for S5-90U/-95U/-100U, ET 100U, ET 200U 2 outputs +-20mAde
Services for SIEMENS 6ES5470-8MB12
SIEMENS |
6ES5470-8MB12 –
additional product information
| Delivery information | |||
|---|---|---|---|
| Export identifier | AL: ECCN: | ||
| Net weight | 0.296 | ||
| Quantity | 1 Stück | ||
| Packaging quantity | 1 | ||
| Additional product information | |||
|---|---|---|---|
| Product status | EOP: 2004-10-01 | ||
| EAN | 4025515054269 | ||
| UPC | / | ||
| Static lot number | 85389091 | ||
| List indicator | / | ||
| Product group | 4234 | ||
| Country of origin | DE | ||
| Compliance with the substance restrictions according to RoHS directive | Since: / | ||
| Product classifications | Version | Classification | |
|---|---|---|---|
| eClass | 4 | / | |
| eClass | 5.1 | / | |
| eClass | 6.0 | / | |
| ETIM | 3 | / | |
| ETIM | 4 | / | |
| ETIM | 5 | / | |
What is 6ES5470-8MB12 and where is it used?
The 6ES5470-8MB12 is an analogue output module from the Siemens SIMATIC S5 product range. Designated as the Analog Output 470, the module is electrically isolated and was developed for the S5-90U, S5-95U, S5-100U, as well as ET 100U and ET 200U systems. It provides two current outputs in the range of ±20 mA. The module is primarily used in existing installations where analogue setpoints must be transmitted to field devices or downstream modules. For maintenance engineers and purchasing departments, the exact order number is important because analogue S5 modules cannot be substituted freely due to differences in signal ranges, wiring requirements and program integration.
Overview of the key technical data and what it means in practice
The module features 2 analogue current outputs, operates using a two-wire connection, is galvanically isolated, and is designed for a maximum load resistance of 300 Ω. The digital representation of the output signal uses 11 bits plus sign. In practice, this means that the module is designed for accurate current setpoint output in legacy S5 architectures but requires the correct burden resistance and proper wiring. In the STEP 5 environment, output values are typically processed via FB251, where user values between UGR and OGR are scaled to the nominal range of the output module. These aspects are crucial when determining whether a replacement part is truly compatible both electrically and from a programming perspective.
Product status, life-cycle status and obsolescence
From a life-cycle perspective, the 6ES5470-8MB12 is clearly a legacy and obsolescence-related product. The EICHLER product page lists a product status of EOP dated 2004-10-01. Siemens also classifies the order number in the SiePortal as a discontinued spare part and states that the product was withdrawn without a replacement product. For maintenance, purchasing and production managers, this means that reliable manufacturer availability can no longer be assumed. Today, supply security is achieved primarily through repair services, tested refurbished units, exchange programmes and strategic stockholding. Consequently, no verified official successor can be specified for this order number. Before any substitution is considered, the signal range, connection method and application software should always be carefully checked.
Available EICHLER services and when they are relevant
For operators of obsolete S5 installations, EICHLER’s services are specifically designed to minimise downtime and maintain availability. The product page specifies a typical repair turnaround time of 2 to 5 days. Repair includes technical cleaning, preventive maintenance, comprehensive functional testing and a minimum 24-month warranty. An optional test report for analogue inputs and outputs is also available. In addition, exchange, refurbished and new units on request are offered as procurement options. This is particularly relevant when an installation cannot wait for a migration project, when downtime is costly, or when the absence of an official successor increases procurement risk. These services help maintain operational capability even after obsolescence, providing both technical and commercial security.
| Fault Description | Possible Solution |
|---|---|
| Why does the 6ES5470-8MB12 provide no output current at all after installation? | First check whether the module is actually wired as a current output using the two-wire connection. With S5 analogue cards, zero signals are often caused by incorrect jumpers or wiring that is still intended for voltage operation. In one PLC forum case, exactly this fault was resolved after the jumpers at the outputs had been set correctly. Also check MANA, the load wiring and the terminal assignment of the channel being used. |
| Why does the output only ever provide the maximum or minimum value? | In many cases, the scaling in the program is incorrect. Siemens describes that FB251 converts values between UGR and OGR into the nominal range of the analogue module. In practice, an incorrect understanding of OGR/UGR often means that it is not the current range that is being limited, but rather the input value that is being interpreted incorrectly. Therefore, check XE, BG, KNKT and the setpoint generation before the FB251 call, and make sure that the setpoint is actually limited to the desired range. |
| Why does one channel respond while the second channel remains without function? | First check the channel addressing and parameterisation. In S5 applications, incorrectly assigned channel parameters or jointly used error and range flags can lead to unexpected behaviour. In one documented case, wiring jumpers had also been set incorrectly; once these were corrected, the additional channel worked. If the wiring and parameterisation are correct and one channel still physically remains at zero or permanently at maximum value, a defective output channel is also possible. |
| Why does my measuring device show an incorrect or unstable mA value? | Check the burden of the connected load. Siemens specifies a maximum load resistance of 300 Ω for the module. If this is exceeded, the output can no longer drive the set current reliably. The measuring method itself is also important: in practice, forum discussions point out that the internal resistance of the measuring device in the mA range must suit the circuit. Therefore, measure with a suitable load, check the entire loop and rule out contact problems at the front connector or terminals. |
| Why does replacement with 6ES5470-8MC12 not work without further changes? | The 6ES5470-8MB12 operates with ±20 mA, whereas the 6ES5470-8MC12 operates with 4 to 20 mA. Both modules look similar and are mentioned in the same S5 environments, but the signal range, scaling and, in some cases, the peripheral expectations differ. Therefore, replacement should only be carried out if the field device, wiring and STEP 5 program are fully adapted to the new current range. A blanket 1:1 substitution is risky without prior verification. |
Is the 6ES5470-8MB12 still regularly available today?
No. The module is no longer available through a predictable manufacturer supply chain. Siemens lists the order number as a discontinued spare part, and the EICHLER product page shows an EOP status of 2004-10-01. For purchasing and maintenance departments, this means that supply today is achieved primarily through repair services, exchange programmes, tested refurbished units or remaining stock, rather than through a reliable new-product supply chain from the manufacturer.
Is there an official Siemens successor for the 6ES5470-8MB12?
No officially verified Siemens successor has been specified for this order number. The Siemens SiePortal states that the product was discontinued without a replacement product. Anyone looking for an alternative should therefore consider not only a similar order number but also the signal range, interface, connection method and STEP 5 application program. With S5 analogue technology in particular, even small differences can quickly lead to malfunctions.
In which systems can the 6ES5470-8MB12 be used?
The module is designed for SIMATIC S5-90U, S5-95U, S5-100U, ET 100U and ET 200U systems. This compatibility information is especially important for purchasing and engineering because it defines the basic platform assignment. However, it does not replace a technical approval check in each individual case, as the slot assignment, wiring, signal type and program handling must also be correct.
What is the difference between the 6ES5470-8MB12 and the 6ES5470-8MC12?
The most important difference is the output range. The 6ES5470-8MB12 is designed for ±20 mA, whereas the 6ES5470-8MC12 is designed for 4 to 20 mA. This difference directly affects field devices, current loops and program scaling. As a result, a system that operates with bipolar positive and negative current values cannot simply be converted to a 4–20 mA module without further consideration.
Which technical points should I check before purchasing or repairing the module?
The key factors are the ±20 mA signal type, the two-wire connection, the maximum load resistance of 300 Ω, the galvanic isolation, and the method by which the setpoint value is generated in STEP 5, typically using FB251. Anyone purchasing solely on the basis of the module designation risks incorrect wiring or improper scaling. For a reliable decision, the order number, system platform, wiring and application logic should always be evaluated together.
When is repair more economical than purchasing a replacement?
Repair is particularly worthwhile when the module can no longer be sourced through normal procurement channels, when the installation must be returned to operation quickly, or when a modernisation project is currently not feasible. According to the EICHLER product page, repair, exchange, refurbished units and new units on request are available for this module. For operators of older S5 installations, this can be economically attractive because it reduces downtime and allows existing equipment to remain in service without immediately requiring a complete retrofit project.
