Siemens SIMATIC S7-300, digital input module SM 321, 4 NAMUR inputs, Ex(i), 24V DC, 120mm depth.
| Parameter | Value |
|---|---|
| Digital inputs | 4 |
| Parameter | Value |
|---|---|
| Rated value (DC) | 8.2 V; from internal power circuit supply |
| Max. | 60 °C |
| Power loss (typ.) | 1.1 W |
| Current consumption from backplane bus (5 V DC), max. | 80 mA |
| Current consumption from load voltage L+ (no load), max. | 50 mA |
| Reverse polarity protection | Yes |
| Isolation: between channels | Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area |
| Isolation: channels to backplane bus | Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area |
| Max. cable length, unshielded | 200 m |
| Parameter | Value |
|---|---|
| Parameterizable | Yes; 0.1 / 0.5 / 3 / 15 / 20 ms (plus 0.25 ms preparation time) |
| Diagnostics function | Yes |
| Group fault indicator (SF, red LED) | Yes |
| Parameter | Value |
|---|---|
| Height | 125 mm |
| Width | 40 mm |
| Depth | 120 mm |
| Weight (approx.) | 230 g |
The 6ES7321-7RD00-0AB0: 40 mm wide, 125 mm tall, 120 mm deep. Requires 20-pin front connector (not included). Channel-to-channel isolation: 60 V DC / 30 V AC in the hazardous area, 400 V DC / 250 V AC outside it. The module also isolates between the channels and the backplane bus – no ground loops from the Ex side to the controller.
It has ATEX II 3 G (2) GD Ex nA [ib Gb] [ib IIIC Db] IIC T4 Gc and FM Class II, Division 2, Groups A, B, C, D T4. The PTB test number is Ex-96.D.2094X.
Yes, it requires a 20-pin front connector (Siemens order code 6ES7392-1AJ00-0AA0 or equivalent). That connector is not included with the module.
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