Siemens SIMATIC S7-1500 analog input module, 6ES7531-7MH00-0AB0, MSI capability, 129 mm depth, 35 mm width, firmware V1.0.0.
| Parameter | Value |
|---|---|
| Number of analog inputs | 16 |
| Input range: 0 to 20 mA | Yes |
| Input range: 4 to 20 mA | Yes |
| Current measurement: 2-wire transducer | Yes; with external supply |
| Current measurement: 4-wire transducer | Yes |
| Input resistance (0 to 20 mA) | 25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC |
| Input resistance (4 to 20 mA) | 25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC |
| Permissible input current, max. (destruction limit) | 40 mA |
| Max. shielded signal cable length | 800 m |
| Parameter | Value |
|---|---|
| Resolution (bit incl. sign), max. | 16 bit |
| Measurement principle | integrating |
| Temperature measurement error (±) | 0.006 %/K |
| Current measurement error (±) | 0.3 % |
| Interference voltage suppression (at interference frequency) | 400 / 60 / 50 / 10 Hz |
| Common-mode interference suppression, min. | 60 dB |
| Common-mode voltage, max. | 4 V |
| Parameter | Value |
|---|---|
| Wire-break detection | Yes; Only for 4 ... 20 mA |
| Diagnostic alarm | Yes |
| Diagnostics function | Yes |
| Limit value alarm | Yes; two upper and two lower limit values in each case |
| Supply voltage monitoring | No |
| Parameter | Value |
|---|---|
| Isolation: channels to backplane bus | Yes |
| Isolation: between channels | No |
| Isolation test voltage | 707 V DC (type test) |
| Parameter | Value |
|---|---|
| Power loss, typ. | 1.2 W |
| Parameter | Value |
|---|---|
| Operating temperature, horizontal mounting, max. | 60 °C |
| Operating temperature, horizontal mounting, min. | -30 °C |
| Operating temperature, vertical mounting, max. | 40 °C |
| Operating temperature, vertical mounting, min. | -30 °C |
| Parameter | Value |
|---|---|
| Width | 35 mm |
| Height | 147 mm |
| Depth | 129 mm |
| Weight, approx. | 250 g |
The 6ES7531-7MH00-0AB0: Wire-break detection only triggers on the 4..20 mA range, not on 0..20 mA. If your BOM specifies 0..20 mA sensors, plan for manual fault checking or a separate IO-Link master upstream. Diagnostics include a diagnostic alarm, limit value alarms (two upper, two lower per channel), channel status LED (green), and a module diagnostics LED (red). No group error LED, no isochronous mode, and no MAINT LED.
The 6ES7531-7NF00-0AB0 is the nearest peer, offering oversampling and isochronous mode. If those features are not required, the 7MH00 is functionally equivalent for standard analog measurement.
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