Module structure. ELPRO 415U-E CONDOR SERIES, 415U-2 CONDOR SERIES, 415U-2

PDF

Documento

User Manual MN032006EN

Effective May 2018

415U Condor-long-range wireless I/O and gateway

Module structure

The 415U module is made up of different interface areas with a central input and output storage area (I/O store). The I/O store is an area of memory made available for the status of the physical on-board I/O and internal I/O registers. It also provides services for other processes within the module.

The I/O store is split into eight different block types:

•

Two blocks made available for bit data (discrete)

•

Two blocks made available for word data (analog)

Two blocks made available for 32-bit words data (counters)

•

Two blocks made available for floating point data (analogs)

Each of these block types in turn support input and output locations that can interface with the physical I/O on the local machine and also be used for data storage when used as a gateway to external devices. These block type locations are illustrated in

Figure 1

and are described in “Register memory map” on page

68.

There are other registers within the database that can be used for system management.

The on-board I/O includes eight discrete I/O, two single-ended analog inputs, two differential analog inputs, and two current sourcing analog outputs. Each discrete I/O can function as either a discrete input (voltage-free contact input) or discrete output

(transistor output). Each I/O point is linked to separate I/O registers within the I/O data store.

The following internal I/O can be accessed from the I/O store. The inputs can be used to interpret the status of a single module or an entire system:

•

Battery voltage

—The battery terminal voltage, displayed as an analog value.

Loop supply

—The +24 Vdc analog loop supply (ALS) used to power analog current loops, displayed as an analog value.

•

Expansion module volts

—The supply voltage of the connected expansion modules, displayed as an analog value.

RSSI—

The radio signal level for the selectable address, reported as a dB level.

Comms Fail

—A selectable register can indicate a

Communications Fail error for a particular message transmission.

The expansion port, allows 115S expansion I/O modules to be added to the module. Expansion I/O is dynamically added to the internal I/O of the 415U module by adding an offset to the address.

Figure 1. Module structure

The radio and Ethernet interfaces (see

Figure 1

) allow the 415U to communicate with other modules within the system using a proprietary protocol called WIB. I/O Messages from other 415U modules are received on the communication ports and then passed to the I/O store which will in turn update the register locations accordingly. The WIB protocol is designed to provide reliable communications suitable for an Ethernet channel or for an open license-free radio channel. It is an extremely efficient protocol for radio communications because the messages are sent using exception reporting (only transmitting when there is a change of an input signal) rather than transmitting all of the time. Update messages can also be configured at a predetermined time for integrity checks.

Each message can be comprised of multiple I/O values, referred to as a “block of I/O.” The messages use error checking and return acknowledgment for greater reliability. Up to four attempts are made when transmitting the message over each hop of the radio path, and if no acknowledgment is received a Comms indication can be flagged.