Designed for use with the 200 Series RTU family, DFS RTU Modules are assembled from the highest quality components and designed to maximize usability while minimizing installation, maintenance, and downtime. Each RTU Module is a separate, self-contained, 5"x 7" printed circuit board (PCB) containing all of the hardware and firmware required to provide specific functions. Each module card edge connector fingers are gold-over-nickel-over-copper plated to inhibit corrosion. The RTU modules are designed with surge protection and carry a 3-Year Warranty against damage due to lightning and surge.
The communication (radio or Ethernet), power supply (AC power or solar), analog I/O and digital I/O are all "plug-in" RTU Modules. Each RTU Module is designed so that it can be easily removed and reinserted without the use of tools or disturbing of signal and power wiring. All RTU Modules are pre-configured at the factory so there are no switches or jumpers to set. Status-at-a-glance LED indicators offer instant visual notification of module problems or I/O condition.
All 200 Series RTUs require two modules: a power module (power supply module or solar power module) and a communication module - Telemetry Interface Module (TIM), Radio Interface Module (RIM) or Fiber Interface Module. All other modules are selected based on the monitor, control or automation requirements. Up to 15 I/O Modules of any combination can be installed in a single RTU containing one, two, or three modular backplanes.
When more complex operations are required at an RTU location, a DFS Programmable Logic Controller (PLC) can be installed for more sophisticated monitoring and controlling of local Input/Output (I/O) modules.
All RTU modules support remote access from the SCADA System Server to the revision level of the module over the communications link (radio or network). All new RTU modules are completely backward compatible with all older modules of like type or earlier revisions (obsolescence-proof).
DFS offers the following modules:
Input / Output (I/O) Modules
RTU Power Modules
Input / Output (I/O) Modules
The Digital Monitor Module (DMM002) accepts up to twelve (12) discrete "on/off" or pulse inputs. Status reporting of each input has an accuracy of +/- 2 seconds, with accuracy being defined as the time of occurrence, not the time it's recorded in the SCADA Server database. The DMM002 incorporates LEDs to indicate: status of each input point; receive communications; transmit communications; CPU fault; and power status. The configuration of the input points as alarms, pump run-time monitors, or pulsed inputs are operator adjustable via SCADA System Server.
The Digital Control Module (DCM003-X) is available is six versions. Variations are in the number of discrete inputs / outputs and compatible voltages. Depending on the version, the DCM003 provides (4 or 8) discrete outputs, and (4 or 8) discrete/pulse inputs. Status reporting of each input has an accuracy of +- 2 seconds, with accuracy being defined as the time of occurrence, not the time it's recorded in the SCADA Server database. The DCM003 incorporates LEDs to indicate: status of each input / output point; receive communications; transmit communications; CPU fault; and power status. The configuration of the input points as alarms, pump run-time monitors, or pulsed inputs are operator adjustable via SCADA System Server.
Any discrete control point has the capability of being automatically controlled by any discrete input, at the same RTU or at any other RTU. This is accomplished during configuration at the SCADA System Server and is available for an unlimited number of control points.
The Analog Monitor Module (AMM002) accepts up to four (4) independent analog inputs. Analog inputs are individually optically isolated. The AMM002 is capable of accepting 4-20 mA or 0-5 VDC on each input, in any combination, and provides 12-bit accuracy. The AMM002 incorporates a 24 VDC "loop power" source. The AMM002 provides support-configurable reporting granularity and alarm thresholds. All configurable parameters are adjustable via the SCADA System Server. The AMM002 incorporates LEDs to indicate: the status of each qualifier input point; receive communications; transmit communications; CPU fault; and power status.
The Analog Control Module (ACM002) provides up to four (4) independent analog outputs. Each output is 4-20 mA capable of driving a 0 to 1000 ohm load. Each output provides 12-bit accuracy and configurable engineering units. The ACM002 incorporates a 24 VDC "loop power" source. All configurable parameters are adjustable via the SCADA System Server. The ACM002 incorporates LEDs to indicate: receive communications; transmit communications; CPU fault; and power status.
Any analog control point has the capability of being automatically controlled by any analog input, at the same RTU or at any other RTU. This is accomplished during configuration at the SCADA System Server and is available for an unlimited number of control points.
The Telemetry Interface Module (TIM) is a microprocessor-controlled module with an integrated serial digital radio. The TIM is programmed to a customer-specific FCC licensed frequency and can interface with up to 15 I/O modules of any combination. The DFS TAC II SCADA System as a whole can accomodate up to (505) TIMs per communications link.
A data buffer on the TIM enables it to query its modules for status between radio polling loops and store that information until it is requested from the central site a particularly useful feature for sites with long radio polling loops.
The TIM also features a wake up / report / sleep mode that aids in battery conservation in solar-powered applications.
The TIM supports four levels of digipeating (store and forward). Digipeating enables the radio signal from a distant RTU to be routed to the central site by passing its message through up to three RTUs. This is a powerful option for RTU locations that that require short antenna heights or those with distance or terrain challenges.
The TIM is fully downward-compatible with the RIM006 and legacy T series radios.
The Radio Interface Module (RIM006-X) incorporates an FM digital synthesized radio transceiver that's programmed to a customer-specific FCC licensed frequency. The RIM006 controls the radio during the polling sequence. All communications are in ASCII and utilize an error detecting data transfer protocol.
The DFS TAC II SCADA System is capable of utilizing up to (505) radio interface modules per communications link, and up to (15) RTU I/O modules per radio interface module. The RIM006 features a service port that provides communications link monitoring locally. The service port also provides the capability to directly monitor and/or control each I/O module in its RTU.
The Fiber Interface Module (FIM001) incorporates a fiber media converter to facilitate fiber-isolated communications over a standard Ethernet network. The FIM001 utilizes a serial tunneling technique to pass data between the SCADA System Server and the RTU I/O modules. Depending on the version, communications between the SCADA System Server and the RTU is 10 or 10/100 Mbps and supports both multi-mode and single mode fiber.
The DFS TAC II SCADA System is capable of utilizing up to (250) fiber interface modules per communications link, and up to (15) RTU I/O modules per fiber interface module.
The I/O and Communication modules in the RTU (Remote Terminal Unit) are powered by a DC voltage provided by the 100 watt PSM003. A battery backup system is also provided to operate the RTU in event of power failure. The PSM003 provides a battery backed, isolated 24 VDC bias voltage source capable of driving up to (24) discrete inputs or (6) analog inputs. The isolated bias voltage source can be utilized to detect and report high well alarms during power outages. The PSM003 is surge protected, UL Listed, and carries a 3-Year Warranty against damage due to lightning and surge.
The Solar Power Module (SPM) is designed for RTU200 applications that require solar power. The SPM requires photovoltaic solar panel technology to capture energy from the sun. The nominal design provides power to an RTU202 for up to 3 days without sunlight, requiring a 43 Watt solar panel and 18 Amp Hour sealed lead acid (SLA) battery. The SPM simultaneously powers the RTU and charges the SLA battery.
A solar-powered RTU202 is ideal for water-level monitoring, system pressure monitoring, and pressure relief valve position monitoring when commercial power is not available or practical. Applications that require additional monitoring points or extended days without sunlight can be easily accommodated with a larger solar panel and battery.
RTU Modules Literature
Power Supply Module
Solar Power Module