Configured for Ethernet-based communication between safety/automation controllers and subsystems in ProSafe-RS Safety Control Station (SCS) networks, the Yokogawa ALE111-S53 (Yokogawa ALE111 Ethernet Communication Module) provides direct physical/electrical execution. The module serializes internal backplane logic frames into discrete digital packets for transmission over twisted-pair electrical media interfaces. It manages data routing constraints to bridge safety controllers with external programmable logic arrays and monitoring infrastructure without imposing processing delays on critical logic networks.
| Parameter | Specification |
|---|---|
| Model | ALE111-S53 (Style S1) |
| Brand | Yokogawa |
| Platform | ProSafe-RS SCS / ProSafe-RS Lite / CENTUM VP / CENTUM CS |
| Origin | Japan |
| Weight | 0.3 kg |
| Dimensions | Standard FIO / N-IO rack slot footprint |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | 0.5 A current consumption via backplane bus |
| Physical Layer | IEEE 802.3 10BASE-T |
| Transmission Speed | 10 Mbps |
| Transmission Method | Half-duplex |
| Connection Configuration | Point-to-point |
| Interface Connector | 1 x RJ-45 port |
| Physical Cable Type | 100 ohm unshielded twisted-pair (UTP) |
| Maximum Segment Length | 100 m |
| Media Access Control | CSMA/CD |
| Embedded Protocols | Modbus slave, DNP3 slave, subsystem communication protocols |
| Base Unit Compatibility | S2SC70, SSC60, SSC50, SSC57, L1SC70, SNB10D, L1NB10D, AFV30, AFV40, A2FV50, A2FV70, ANB10, ANB11, ANR10, AFF50 |
| Operating Humidity | 5 to 95% RH (non-condensing) |
The communication module acts as an isolated data gateway that transmits non-safety process variables from 4-20 mA HART loop protocol networks to auxiliary monitoring stations. The hardware implements rigid electrical separation parameters to enforce channel-to-channel isolation limits between the external RJ-45 node path and the internal control bus logic. This structural decoupling keeps field-side ground shifts from corrupting the internal data bus, permitting concurrent subsystem reads from temperature transmitters that incorporate active cold junction compensation parameters without reducing system execution metrics.
Q: How does this module ensure it does not compromise the active safety loops inside a ProSafe-RS control station?
A: The module architecture relies on dedicated logic segregation paths that allow read/write subsystem tasks to proceed via Modbus or DNP3 without modifying or interrupting the execution priorities of the safety-certified execution kernel.
Q: Can the network speed be adjusted to auto-negotiate 100 Mbps fast Ethernet connections?
A: No. The physical layer transceiver design is fixed to IEEE 802.3 10BASE-T standards and operates exclusively at 10 Mbps using half-duplex transmission structures over standard 100 ohm twisted-pair connections.
Q: Is this communication module approved for continuous operation in corrosive industrial environments?
A: The environmental specification covers standard 0 to 55 deg C ranges, but verification of suffix and style coatings is required to confirm compliance with specific ISA G3 atmospheric corrosion protection levels.
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