Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
The Honeywell 621-6550 is a 24VDC source digital output module with 16 points designed for use within the IPC 621 I/O System. The module operates in conjunction with IPC 620 series programmable controllers to handle field output device driving and control signaling. It connects to the system through standard rack assemblies and features field wiring interface support using double swing terminal blocks.
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | 621-6550 |
| Product Type | Digital Output Module |
| System Compatibility | IPC 620 / IPC 621 I/O System |
| Number of Points | 16 points |
| Voltage Rating | 24VDC |
| Output Type | Source |
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Returns & Warranty

The Honeywell 621-6550 is a 24VDC source digital output module with 16 points designed for use within the IPC 621 I/O System. The module operates in conjunction with IPC 620 series programmable controllers to handle field output device driving and control signaling. It connects to the system through standard rack assemblies and features field wiring interface support using double swing terminal blocks.
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | 621-6550 |
| Product Type | Digital Output Module |
| System Compatibility | IPC 620 / IPC 621 I/O System |
| Number of Points | 16 points |
| Voltage Rating | 24VDC |
| Output Type | Source |
Global Express Shipping
Returns & Warranty
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| Country of origin |
United States
|