How to Select an Interface Relay for PLC Outputs
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
The Siemens 6ES7924-2CC20-0AA0 is a SIMATIC TOP connect TPA connection module that wires analog I/O modules of the SIMATIC S7-1500 through a 50-pole IDC field connector. It has screw terminals without LED, is rated 24 V DC (max 50 V) at up to 1 A per pin, and mounts on a 35 mm or 15 mm DIN rail.
The 50-pole IDC field connector and 72-terminal block match S7-1500 analog modules, not the 16-pole TPA variant built for the older S7-300 analog modules, so confirm the target rack before ordering. Screw terminals rated at 0.4-0.5 N.m suit panels where analog signal wiring gets re-torqued during maintenance; the push-in TPA sibling trades that for faster initial wiring at a lower 0.27 kg weight.
| target system | SIMATIC S7-1500 |
|---|---|
| suitability for use | Analog I/O modules |
| product brand name | SIMATIC Top connect |
| product type designation | Fully modular connection |
| product designation | Connection module |
| operating voltage: at DC / rated value | 24 V |
|---|---|
| operating voltage: rated value | 50 V |
| operating voltage: at DC / maximum | 50 V |
| ampacity / per pin / maximum | 1 A |
| continuous current / at DC / per signal cable / maximum | 1 A |
| product function / infeed function | Yes |
| product component: PE connection | No |
| product component: shield connection | No |
| product component: disconnector | No |
| product feature / cross-connectable | No |
| number of terminals | 72; Intended for analog |
|---|---|
| type of connecting terminal | Screw-type terminal |
| position / of the terminal | Top |
| number of terminal levels | 1 |
| design of terminal / terminal levels internally linked | No |
| type of electrical connection / for connecting cable | Plug-in connection |
| number of poles / at the 1st interface | 50; IDC connector with installed strain relief for the connecting cable |
| number of the plug contacts / of the electrical connection | 1 |
| wire length / maximum | 30 m; between front connector module and Connection module |
| type of connectable conductor cross-sections / solid | No |
| connectable conductor cross-section: for flexible conductor / with core end processing | 0.5 ... 2.5 mm2; End sleeve according to DIN 46228/1 |
| connectable conductor cross-section: stranded | 0.5 ... 2.5 mm2 |
| connectable conductor cross-section: finely stranded / with core end processing | 0.5 ... 2.5 mm2 |
| number of cables / per connection | 2; Connection for internal system: Combination of 1 or 2 Wires until the sum total of cross sections be achieved in a ferrule. |
| width of screwdriver blade | 3.5 mm |
| tightening torque standards, specifications, approvals | 0.4 ... 0.5 N·m |
| certificate of suitability: cULus approval | Yes |
| design tested acc. to type of protection / EEx e | No |
| overvoltage category | 2 |
| degree of pollution | 2 |
| combustibility class according to UL 94 | V1 |
| Part number | 6ES7924-2CC20-0AA0 |
|---|---|
| Type designation | Fully modular connection |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4025515153887 |
| ETIM class | EC000900 |
| eCl@ss | 27250112 |
| Environmental Product Declaration | Yes |
|---|---|
| global warming potential [CO2 eq]: total | 91.2 kg |
| global warming potential [CO2 eq]: during manufacturing | 3.3 kg |
| global warming potential [CO2 eq]: during operation | 87.5 kg |
| global warming potential [CO2 eq]: after end of life | 0.31 kg |
| ambient temperature: during operation | 0 ... 60 °C |
|---|---|
| ambient temperature: during storage | -40 ... +70 |
| width × height × depth | 130 mm × 76 mm × 60 mm |
|---|---|
| mounting type | DIN rail 35 mm, DIN rail 15 mm |
| mounting position | any |
| height / with lowest-profile installation | 60 mm |
| insulation material | other |
| color: of the enclosure | grey |
| color: of the light source | without |
| product component / required / end cover plate | No |
| other information | Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified) |
|---|---|
| marketing text | The TPA connection module for analog modules with screw terminals for 50-pin connecting cables without LED for signalling forms the interface between the connecting cables of the peripherals coming from the field and the SIMATIC S7-1500. This is mounted on the DIN rail and, thanks to its functionality with screw terminals, is exactly adapted to the respective task. This connection module is part of the fully modular SIMATIC TOP connect connection for the fastest and safest system cabling. In addition to low wiring costs, error sources in cabling can be significantly reduced. Sensors and actuators from the peripherals are combined with the connection modules of SIMATIC TOP connect and connected to the SIMATIC S7-1500 via cable and front plug-in module. |
| ETIM | 10 EC000900 |
|---|---|
| UNSPSC | 15 39-12-14-10 |
| Net weight | 0.41 kg |
|---|---|
| Country of origin | Romania |
| Shipping weight | 0.91 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of Fully modular connection is 1 A.
The rated operational voltage of Fully modular connection is 24 V AC.
The tariff (HS) code on file for Fully modular connection is 85366990.
The EAN (GTIN) of Fully modular connection is 4025515153887.
Fully modular connection ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
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