Yokogawa ALF111-S50 Foundation Fieldbus Communication Module
The Yokogawa ALF111-S50, also cataloged as the ALF111 Foundation Fieldbus Communication Module, serves as the primary ALF111 Communication Module utilized to execute Foundation Fieldbus H1 segment interface processing across Field Control Station (FCS) platforms.
Suffix Breakdown & Model Matrix
- ALF111: Base module hardware series representing Foundation Fieldbus H1 communication interface cards.
- -S5: Standard functionality specification code designating dual-redundancy capability support within compatible node sub-racks.
- 0: Standard option suffix signifying base manufacturing configuration without special conformal coating requirements.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ALF111-S50 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.4 kg |
| Dimensions | 260 mm x 180 mm x 60 mm |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | 0.5 A or less |
| Fieldbus Interface | FOUNDATION Fieldbus H1 (31.25 kbps) |
| Isolation Voltage | 1500 V AC (field-to-system, channel-to-channel) |
| Device Capacity | Maximum 32 devices per segment |
| Control I/O Capacity | Maximum 48 points per segment |
| Redundancy | Dual-module redundancy within same node |
| Relative Humidity | 35% to 85% RH (non-condensing) |
FOUNDATION Fieldbus Connectivity and Channel Isolation
The Yokogawa ALF111-S50 module incorporates FOUNDATION Fieldbus H1 connectivity running at a deterministic 31.25 kbps transmission rate to interface fieldbus transmitters and actuators with the central Field Control Station (FCS). Featuring 1500 V AC galvanic channel-to-channel and field-to-system isolation, the unit protects system electronics against high common-mode voltage spikes and loop ground noise. Integrated Link Active Scheduler (LAS) and Clock Master capabilities allow execution of segment timing control directly at the module layer while built-in terminators stabilize network segment impedance.
Frequently Asked Questions
Q: How does the ALF111-S50 handle module failover when deployed in a dual-redundant configuration?
A: When two ALF111-S50 modules are mounted in adjacent slots of the same node, the secondary module mirrors system bus tables and automatically takes over fieldbus segment communication without dropping active H1 transaction frames upon primary card failure.
Q: Are external bus terminators required when connecting field devices to the ALF111-S50 clamp terminals?
A: Internal terminators are built into the module connection assembly, removing the need for external terminal resistors on the module side of the H1 segment.
Field Installation Guidelines
- Ensure power to the node sub-rack is disconnected prior to inserting or removing the ALF111-S50 card.
- Connect fieldbus H1 bus wires to the pressure clamp terminals, strictly adhering to positive, negative, and shield polarity designations.
- Ground cable shields at a single point on the sub-rack earth bar to prevent ground loop current generation across field segment runs.
- Verify that total connected field instruments do not exceed 32 devices or 48 control I/O points per fieldbus segment.
- Secure all module mounting screws to guarantee consistent backplane connector pin insertion and thermal grounding path execution.
Yokogawa ALF111-S50 Foundation Fieldbus Communication Module
Yokogawa ALF111-S50 Foundation Fieldbus Communication Module
The Yokogawa ALF111-S50, also cataloged as the ALF111 Foundation Fieldbus Communication Module, serves as the primary ALF111 Communication Module utilized to execute Foundation Fieldbus H1 segment interface processing across Field Control Station (FCS) platforms.
Suffix Breakdown & Model Matrix
- ALF111: Base module hardware series representing Foundation Fieldbus H1 communication interface cards.
- -S5: Standard functionality specification code designating dual-redundancy capability support within compatible node sub-racks.
- 0: Standard option suffix signifying base manufacturing configuration without special conformal coating requirements.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ALF111-S50 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.4 kg |
| Dimensions | 260 mm x 180 mm x 60 mm |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | 0.5 A or less |
| Fieldbus Interface | FOUNDATION Fieldbus H1 (31.25 kbps) |
| Isolation Voltage | 1500 V AC (field-to-system, channel-to-channel) |
| Device Capacity | Maximum 32 devices per segment |
| Control I/O Capacity | Maximum 48 points per segment |
| Redundancy | Dual-module redundancy within same node |
| Relative Humidity | 35% to 85% RH (non-condensing) |
FOUNDATION Fieldbus Connectivity and Channel Isolation
The Yokogawa ALF111-S50 module incorporates FOUNDATION Fieldbus H1 connectivity running at a deterministic 31.25 kbps transmission rate to interface fieldbus transmitters and actuators with the central Field Control Station (FCS). Featuring 1500 V AC galvanic channel-to-channel and field-to-system isolation, the unit protects system electronics against high common-mode voltage spikes and loop ground noise. Integrated Link Active Scheduler (LAS) and Clock Master capabilities allow execution of segment timing control directly at the module layer while built-in terminators stabilize network segment impedance.
Frequently Asked Questions
Q: How does the ALF111-S50 handle module failover when deployed in a dual-redundant configuration?
A: When two ALF111-S50 modules are mounted in adjacent slots of the same node, the secondary module mirrors system bus tables and automatically takes over fieldbus segment communication without dropping active H1 transaction frames upon primary card failure.
Q: Are external bus terminators required when connecting field devices to the ALF111-S50 clamp terminals?
A: Internal terminators are built into the module connection assembly, removing the need for external terminal resistors on the module side of the H1 segment.
Field Installation Guidelines
- Ensure power to the node sub-rack is disconnected prior to inserting or removing the ALF111-S50 card.
- Connect fieldbus H1 bus wires to the pressure clamp terminals, strictly adhering to positive, negative, and shield polarity designations.
- Ground cable shields at a single point on the sub-rack earth bar to prevent ground loop current generation across field segment runs.
- Verify that total connected field instruments do not exceed 32 devices or 48 control I/O points per fieldbus segment.
- Secure all module mounting screws to guarantee consistent backplane connector pin insertion and thermal grounding path execution.
