Allen-Bradley 1771-IG: TTL Logic and 5 V Wiring Checks
Check 1771-IG TTL HIGH/LOW logic thresholds, field supply ripple and 1771-WC wiring before replacing an input module.
Manufacturer: BECKHOFF
Product No.: C9900-E741
Country of origin:Germany
Product Type: Control Panel Accessories
Payment: T/T, Western Union
Weight: 500g
Dimensions: drawings with dimensions of the push-button e x tensions as AutoCAD DXF file
Shipping port: Xiamen
Warranty: 12 months
The BECKHOFF C9900-E741 is a dedicated push-button extension designed for integration with BECKHOFF CP6xxx and CP7xxx series Control Panels and Panel PCs featuring a 15-inch display without a keyboard. Engineered for machine-level operator control and monitoring, this panel extension mounts directly to the right side of compatible industrial control units to expand physical command capabilities in industrial automation environments.
This unit features 16 integrated push-button keys equipped with signal lamps utilizing Siemens Signum square 30 x 30 mm caps, accompanied by an emergency stop key. Operator commands are transmitted via CP-Link or USB communication, while individual key caps support custom labeling to suit specific application requirements.
| Parameter | Specification |
|---|---|
| Manufacturer | BECKHOFF |
| Exact Model | C9900-E741 |
| Product Type | Push-button extension |
| Compatibility | BECKHOFF CP6xxx and CP7xxx Control Panels and Panel PCs (15-inch display, without keyboard) |
| Mounting Position | Right side |
| Country of Origin | Germany |
| Parameter | Specification |
|---|---|
| Push-Button Keys | 16 keys with signal lamp |
| Key Type | Siemens Signum square, 30 x 30 mm |
| Emergency Stop Key | 1 x Siemens Signum (directly wireable) |
| Labeling | Customizable via inserts under push-button caps |
| Parameter | Specification |
|---|---|
| Transmission Interface | CP-Link or USB |
| Push-Button Contact 1 | Transmitted via CP-Link or USB (1 normally-open contact) |
| Push-Button Contact 2 | Directly wireable via internal terminal row (2nd normally-open contact) |
| Signal Lamp Control | Transmitted via CP-Link or USB |
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Returns & Warranty

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Returns & Warranty
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| Country of origin |
Germany
|