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.
Optimized for high-density pulse logging in multi-source electrical environments, the Mitsubishi Electric QD60P8-G serves as a high-performance 8-channel pulse input interface for the MELSEC Q control platform. By featuring complete inter-channel galvanic isolation, this module mitigates ground potential differences and signal interference when monitoring disparate field instruments. The unit processes single-phase pulse inputs across flexible voltage ranges, making it an ideal choice for complex utility tracking, flow metering, and synchronization tasks within industrial automation infrastructures.
| Parameter | Value / Specification |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Code | QD60P8-G |
| Product Series | MELSEC Q Series |
| Module Type | Inter-channel Isolated Pulse Input Unit |
| Number of Channels | 8 channels (individually isolated) |
| Count Input Signal Phase | 1-phase input |
| Signal Voltage Levels | 5VDC / 12 to 24VDC |
| Maximum Counting Speed | 30 kpps (selectable: 30 kpps, 10 kpps, 1 kpps, 100 pps, 50 pps, 10 pps, 1 pps, 0.1 pps) |
| Count Ranges | Sampling: 16-bit binary (0 to 32767) Integrated count: 32-bit binary (0 to 99999999) Input pulse value: 32-bit binary (0 to 2147483647) |
| Counter Modes | Linear counter, Ring counter |
| Withstand Voltage | Between channels: AC 1780 V for 1 min Between AC terminals and ground: AC 1500 V for 1 min Between DC terminals and ground: AC 500 V for 1 min |
| Insulation Resistance | DC 500 V, 5 MOhm or more |
| Wiring Interface | 18-point screw terminal block (M3 screws) |
| I/O Points Occupied | 32 points (intelligent function module classification) |
| Internal Current Consumption | 0.58 A (at 5VDC) |
| Dimensions (H x W x D) | 98 mm x 27.4 mm x 90 mm |
| Net Weight | 0.17 kg |
| Shipping Weight (Calculated) | 1.10 kg |
The QD60P8-G fits directly into any standard Q-series backplane. For legacy migrations, ensure that your existing engineering configuration tool (GX Works2 or GX Works3) has the corresponding QD60P8-G parameter profiles installed. If upgrading from non-isolated pulse input modules, review your grounding layouts as the isolated design of this model removes the necessity of external loop isolation barriers.
When configuring the input pulse counting speed, select the filter threshold closely matching your physical signal frequency. Setting the filter rate excessively high (e.g., 30 kpps for a 10 pps flow meter) can cause mechanical contact bounce or electrical transient noise to register as extra, spurious counts. Ensure that the logic level voltage corresponds to the specific physical wiring points to prevent thermal overload on the input channels.
Always route the pulse input cables separately from high-voltage AC motor lines to prevent electromagnetic coupling. To secure high-noise immunity, utilize shielded twisted-pair (STP) cabling, grounding the shield at a single point on the control panel chassis. Do not over-torque the M3 terminal screws beyond the recommended limits (typically 0.42 to 0.58 N-m) to prevent strip damage to the internal connector block.
Isolate and lock out all primary and auxiliary power sources before installing, removing, or wiring the module. Failure to de-energize the PLC backplane and field wiring prior to module insertion can result in permanent processor damage, module destruction, or electrical shock hazard.
Mount the QD60P8-G onto the Q-series base unit by inserting the module's bottom retaining tab into the base slot, and then pivot the module firmly into place until it seats securely.
Secure the module to the base unit using the top mounting screw. This maintains connection integrity under high-vibration conditions.
Wire your pulse sources to the 18-point terminal block matching your signal level configurations (5VDC or 12 to 24VDC pins).
Apply backplane and field power, then proceed with digital filtering configuration and counter mode calibration within your GX Works programming software environment.
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Optimized for high-density pulse logging in multi-source electrical environments, the Mitsubishi Electric QD60P8-G serves as a high-performance 8-channel pulse input interface for the MELSEC Q control platform. By featuring complete inter-channel galvanic isolation, this module mitigates ground potential differences and signal interference when monitoring disparate field instruments. The unit processes single-phase pulse inputs across flexible voltage ranges, making it an ideal choice for complex utility tracking, flow metering, and synchronization tasks within industrial automation infrastructures.
| Parameter | Value / Specification |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Code | QD60P8-G |
| Product Series | MELSEC Q Series |
| Module Type | Inter-channel Isolated Pulse Input Unit |
| Number of Channels | 8 channels (individually isolated) |
| Count Input Signal Phase | 1-phase input |
| Signal Voltage Levels | 5VDC / 12 to 24VDC |
| Maximum Counting Speed | 30 kpps (selectable: 30 kpps, 10 kpps, 1 kpps, 100 pps, 50 pps, 10 pps, 1 pps, 0.1 pps) |
| Count Ranges | Sampling: 16-bit binary (0 to 32767) Integrated count: 32-bit binary (0 to 99999999) Input pulse value: 32-bit binary (0 to 2147483647) |
| Counter Modes | Linear counter, Ring counter |
| Withstand Voltage | Between channels: AC 1780 V for 1 min Between AC terminals and ground: AC 1500 V for 1 min Between DC terminals and ground: AC 500 V for 1 min |
| Insulation Resistance | DC 500 V, 5 MOhm or more |
| Wiring Interface | 18-point screw terminal block (M3 screws) |
| I/O Points Occupied | 32 points (intelligent function module classification) |
| Internal Current Consumption | 0.58 A (at 5VDC) |
| Dimensions (H x W x D) | 98 mm x 27.4 mm x 90 mm |
| Net Weight | 0.17 kg |
| Shipping Weight (Calculated) | 1.10 kg |
The QD60P8-G fits directly into any standard Q-series backplane. For legacy migrations, ensure that your existing engineering configuration tool (GX Works2 or GX Works3) has the corresponding QD60P8-G parameter profiles installed. If upgrading from non-isolated pulse input modules, review your grounding layouts as the isolated design of this model removes the necessity of external loop isolation barriers.
When configuring the input pulse counting speed, select the filter threshold closely matching your physical signal frequency. Setting the filter rate excessively high (e.g., 30 kpps for a 10 pps flow meter) can cause mechanical contact bounce or electrical transient noise to register as extra, spurious counts. Ensure that the logic level voltage corresponds to the specific physical wiring points to prevent thermal overload on the input channels.
Always route the pulse input cables separately from high-voltage AC motor lines to prevent electromagnetic coupling. To secure high-noise immunity, utilize shielded twisted-pair (STP) cabling, grounding the shield at a single point on the control panel chassis. Do not over-torque the M3 terminal screws beyond the recommended limits (typically 0.42 to 0.58 N-m) to prevent strip damage to the internal connector block.
Isolate and lock out all primary and auxiliary power sources before installing, removing, or wiring the module. Failure to de-energize the PLC backplane and field wiring prior to module insertion can result in permanent processor damage, module destruction, or electrical shock hazard.
Mount the QD60P8-G onto the Q-series base unit by inserting the module's bottom retaining tab into the base slot, and then pivot the module firmly into place until it seats securely.
Secure the module to the base unit using the top mounting screw. This maintains connection integrity under high-vibration conditions.
Wire your pulse sources to the 18-point terminal block matching your signal level configurations (5VDC or 12 to 24VDC pins).
Apply backplane and field power, then proceed with digital filtering configuration and counter mode calibration within your GX Works programming software environment.
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Returns & Warranty
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| Country of origin |
United States
|