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Product description
The Siemens 7MH4138-6AA00-0BA0 is a single-channel electronic weighing module in the TM SIWAREX WP321 ST series for the SIMATIC ET 200SP distributed I/O system. The module connects platform or hopper scales with analog load cells or strain gauges in full-bridge circuits. Its load-cell input processes characteristic values from 1 to 4 mV/V and supports both 4-wire and 6-wire connections. Three measuring ranges from -1 to +1 mV/V, -2 to +2 mV/V and -4 to +4 mV/V cover different signal levels. Measured values are sampled at 600 Hz. Siemens specifies a resolution of ±500.000 parts per mV/V and an error limit of 0.05% of the full-scale value. One RS485 interface provides communication with SIWATOOL V7, SIWAREX DB or a remote display at data rates up to 115.2 kbit/s. The documented maximum cable length is 1,000 m for this interface, while the load-cell cable may be up to 500 m long when the specified SIWAREX cable is used. The supported full-bridge resistance range is 40 to 4,100 Ω. Mechanically, the device has a 15-mm format and is paired with BaseUnit type A0. Its mechanical coding element is type B, and the data sheet specifies a diagnostic function with a diagnostic alarm. For horizontal installation, Siemens states an operating temperature range from -25 to 60 °C. The module measures 15 mm in width, 57 mm in height and 72 mm in depth, with an approximate device weight of 31 g. The complete order number identifies this single-channel WP321-ST version with one load-cell interface and one RS485 interface.
Example image – The item supplied will have the stated manufacturer or type number and the stated condition category. Serial number, manufacturing date, labels, colour, packaging and normal signs of use or storage may differ. Specifications
| Manufacturer | Siemens |
|---|---|
| Product series | SIMATIC ET 200SP / TM SIWAREX WP321 ST |
| Manufacturer/order/identification number | 7MH4138-6AA00-0BA0 |
| Device type | Single-channel weighing module |
| Weighing channels | 1 channel |
| Load-cell type | Analog strain-gauge load cells, full bridge |
| Load-cell characteristic value | 1 to 4 mV/V |
| Measuring ranges | -1 to +1 mV/V; -2 to +2 mV/V; -4 to +4 mV/V |
| Sampling rate | 600 Hz |
| Signal resolution | ±500.000 parts per mV/V |
| Interface | 1 × RS485 |
| RS485 data rate | max. 115.2 kbit/s |
| RS485 cable length | max. 1,000 m at up to 115 kbit/s |
| Load-cell cable length | max. 500 m with SIWAREX 7MH4702-8AG |
| Full-bridge resistance | 40 to 4,100 Ω |
| Error limit | 0.05% of full-scale value according to DIN 1319-1 |
| Operating temperature | -25 to 60 °C with horizontal installation |
| Dimensions | 15 × 57 × 72 mm |
| Weight | approx. 31 g |
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Which load-cell signals does the Siemens 7MH4138-6AA00-0BA0 process?
The module processes analog strain-gauge load cells in full-bridge circuits with characteristic values from 1 to 4 mV/V. The documented measuring ranges are -1 to +1 mV/V, -2 to +2 mV/V and -4 to +4 mV/V.
Which dimensions and weight does Siemens specify?
For 7MH4138-6AA00-0BA0, the Siemens data sheet specifies a width of 15 mm, a height of 57 mm and a depth of 72 mm. The device weight is approximately 31 g.
What applies if an item develops a defect within 14 days?
For the condition categories “Used, removed from an installation” and “New, old stock”, the contractual 14-day right of return in the event of a defect applies. The defect must occur within 14 calendar days after delivery and be reported in text form within the same period.
In particular, the REHA tamper-evident seal must remain fully intact and our RMA approval is required before return. In an accepted case, we decide between replacement and refund. Details in Section 11 of the Terms.
Which shipping methods and delivery times are available?
The shipping method, shipping cost and estimated delivery time are confirmed for the specific order. Depending on the item, destination and urgency, we can check parcel, express or freight shipping as well as collection.
A delivery date is binding only if we expressly confirm it as binding.
Which payment terms apply?
The payment terms stated in the checkout or order confirmation apply. Depending on the order and customer, payment is made in advance or against invoice.
International deliveries and deliveries to new customers are generally made against advance payment unless we expressly confirm another payment arrangement.
Can I return an item ordered incorrectly or found incompatible?
No. There is no general B2B right of return, exchange, cancellation or withdrawal. Incorrect or duplicate orders and a lack of suitability or compatibility with the customer’s installation are not covered by the contractual 14-day right of return in the event of a defect. Details in Section 12 of the Terms.
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