Request/Grant Logic Unit

Product Specifications

Technical details and manufacturing context for Request/Grant Logic Unit

Definition

The Request/Grant Logic Unit is a critical sub-component of an Arbiter/Scheduler system responsible for processing incoming resource requests, applying priority rules and scheduling algorithms, and generating grant signals to allocate system resources efficiently. It implements the decision-making logic that determines which requests are serviced and in what order, based on configured policies and real-time system conditions. This unit is typically implemented using digital logic circuits, either as a dedicated integrated circuit or as part of a programmable logic device. It operates within a defined electrical and environmental envelope, requiring a 24 V DC supply (±10%), consuming 0.5–2.0 A depending on load and switching frequency, and responding to requests within 10 ms or less. The unit supports 8 to 32 request inputs and matching grant outputs, each capable of sourcing 0.5–2.0 A continuously. It is designed for industrial environments, operating from -40 to 85 °C and storing from -55 to 125 °C, with non-condensing humidity tolerance of 5–95% RH. The enclosure provides ingress protection rated IP54 to IP65 per IEC 60529, and the unit offers 1500 V AC isolation between logic and I/O per IEC 61010. Input signals accept standard PLC-level voltages from 0 to 24 V DC. Physical characteristics vary with channel count and enclosure, with dimensions ranging from 100x75x25 mm to 200x150x50 mm and weight from 0.5 to 2.5 kg. The unit is intended for DIN-rail or panel mounting. All specifications are reference ranges; actual values must be confirmed with the manufacturer for the specific model and application. Standards listed are for verification purposes and do not imply certification of any particular product.

Working Principle

The unit continuously monitors request lines from multiple sources, evaluates each request against priority rules and scheduling algorithms (such as round-robin, fixed-priority, or weighted fairness), and generates corresponding grant signals to enable resource access. It typically operates on clock cycles, with decision logic implemented through combinatorial and sequential digital circuits or programmable logic. The decision-making process involves comparing incoming requests against configured policies, considering real-time system conditions, and outputting grant signals to the appropriate resource interfaces. The unit ensures that only one request is granted at a time per resource, preventing conflicts and ensuring orderly resource allocation.

Common Materials

Semiconductor silicon, Copper interconnects, Encapsulation polymer

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Voltage	24 ±10% V DC	Standard industrial supply; outside range may cause malfunction.
Current Consumption	0.5–2.0 A	Depends on load and switching frequency.
Response Time	≤10 ms	Time from request to grant decision.
Number of Request Inputs	8–32	Configurable; more inputs require larger footprint.
Number of Grant Outputs	8–32	Matches request inputs; each output drives one resource.
Operating Temperature	-40–85 °C	Industrial grade; outside range may cause timing errors.
Storage Temperature	-55–125 °C	Non-operating survival range.
Humidity (Non-condensing)	5–95 % RH	Condensation may cause short circuits.
Ingress Protection	IP54–IP65	Higher IP for dusty or wet environments.IEC 60529
Signal Level (Input)	0–24 V DC	Accepts standard PLC-level signals.
Output Current per Channel	0.5–2.0 A	Maximum continuous current per grant output.
Isolation Voltage	1500 V AC	Between logic and I/O; for safety.IEC 61010
Weight	0.5–2.5 kg	Depends on number of channels and enclosure.
Dimensions (W x H x D)	100x75x25–200x150x50 mm	Compact DIN-rail or panel mount.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Request Interface Part
Receives and synchronizes incoming request signals from multiple sources

Material: Semiconductor logic gates
Priority Encoder
Determines the highest priority request among active inputs based on configured rules

Material: Semiconductor logic gates
Scheduling State Machine
Implements the scheduling algorithm and maintains state for fair resource allocation

Material: Programmable logic or dedicated circuitry
Grant Generator
Produces output grant signals to enable resource access for selected requests

Material: Semiconductor output drivers

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Request/Grant Logic Unit.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Arbiter/Scheduler

View system integration details

Manufacturers of Request/Grant Logic Unit

Manufacturer profiles associated with Request/Grant Logic Unit.

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Frequently Asked Questions

What is the operating voltage range?

The unit requires a 24 V DC supply with a tolerance of ±10%. Operating outside this range may cause malfunction.

How many request inputs and grant outputs are available?

The unit supports 8 to 32 request inputs and an equal number of grant outputs. The exact count is configurable and depends on the model.

What is the response time from request to grant?

The response time is 10 ms or less, measured from the assertion of a request to the generation of the corresponding grant signal.

What environmental conditions can the unit withstand?

It operates from -40 to 85 °C and can be stored from -55 to 125 °C. Humidity must be non-condensing between 5% and 95% RH. Ingress protection is IP54 to IP65 per IEC 60529.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 100 psi
other spec:	Signal frequency: DC to 10 MHz, Power supply: 3.3V ±5%
temperature:	-40°C to +85°C

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards