Seneca Z-PC SERIES User manual

Z-PC Line
Z-RTU
User Guide

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INDEX
1 GENERAL FEATURES 3
2 SPECIFICHE TECNICHE 4
2.1 C OMMUNICATION P ORTS 4
2.2 E LECTRICAL AND T HERMOMECHANIC FEATURES 4
2.3 A NALOG I NPUTS F EATURES 5
2.4 A NALOG I NPUTS F EATURES 5
2.5 A NALOG OUTPUTS F EATURES 5
2.6 D IGITAL OUTPUTS F EATURES 6
2.7 P OWER SUPPLY MEASURE 7
2.8 F LOATING B ATTERY F EATURES 7
2.9 I NTERNAL M ODEM 7
2.9.1 GSM/GPRS MODEM 7
2.9.2 PSTN M ODEM 7
2.10 S YSTEM P ROTOCOLS 7
3 STRUCTURE AND INTERFACE 9
3.1 L ED I NDICATIONS ON Z-RTU 9
4 ELECTRICAL CONNECTIONS 11
4.1 P OWER S UPPLY 11
4.2 A NALOG I NPUTS 11
4.3 D IGITAL I NPUTS 11
4.4 A NALOG OUTPUTS 12
4.5 D IGITAL O UTPUTS 12
4.6 P ORT 0 RS232 13
4.7 P ORT 1 RS485 13
4.8 P ORT 2 RS485/RS232 14
4.9 D IP -S WITCHES S ETTINGS 14
5 IIC REGISTERS 17

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1 GENERAL FEATURES
Z-RTU is compact unit, provided of IEC 61131 configurator and software tool for the telecontrol.
Z-RTU is a simple solution to use and install, versatile for remote control, datalogging and I/O
management. With particularly small size (185 x 242 x 36,90 mm) and strong aluminium case, Z-
RTU offers excellent calculus capabilities (CPU µP RISC 32 bit – 20 MIPS) and memory (Flash
dati 16 MB, RAM 8 MB, 236 bytes retentive memory).
Z-RTU on the base version has several input and output channels (digital and analog). Besides the
I/O density may be doubled through the optional expansion board.
The base configuration manages the following I/O channels, each group galvanically isolated:
•8 digital inputs (with internal or external power supply)
•2 analog inputs (14 bit resolution and possibity to select loop power supply )
•4 digital outputs (SPDT relay), individually isolated.
•1 analog output (in voltage/current).
Through the software it is possible to visualize the measure in tenths of Volts of the main power
supply.
Z-RTU handles an industrial dual band full type approval GSM modem for the remote
connections, (alternatively, a PSTN modem may be installed) to allow the remote management of
alarms, diagnostics and automatic data sending. For all these features Z-RTU is the ideal solution
for environmental monitoring applications, water and drainage systems, gas control and energy
management.

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2 SPECIFICHE TECNICHE
In this chapter the technical specifications of the Z-RTU will be illustrated refering to the
communication ports, electrical and thermomechanic features and I/O signals management.
2.1 C OMMUNICATION P ORTS
Z-RTU handles the following communication ports:
•Ethernet Port for Local Network connection.
•PORT 0: RS232 serial port reserved to view the debug of the device functioning.
•PORT 1: RS485 serial port (Modbus RTU Master) to connect with I/O slaves devices.
•PORT 2: serial port configurable as RS232 or RS485.
•Internal Port (not accessible from the user), utilized for the connection with the internal
modem ( GSM or PSTN at choice of the user).
2.2 E LECTRICAL AND T HERMOMECHANIC FEATURES
ELECTRICAL
Power Supply 10-30 Vdc
Max Consumption 15 W max
7 W min
11 W (GSM idle)
Leds Indicators - Internal power supplies
- GSM modem Status
- Ethernet Link
- Power
- Error
- Run
- Digital Inputs/Outputs
Categoria di installaz. II
Pollution Degree 2
Protection Index IP20
THERMOMECHANICS
Functioning Temperature -10..55°C (advised)
Storage Temperature -20..+70 °C
Humidity 30..90% a +40 °C (non-condensing)
Dimensions 185 x 242 x 36,90 mm
Weight 875 g
Case Aluminium

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Connections Removable Terminals with section up to
2.5 mm
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2.3 A NALOG I NPUTS F EATURES
Z-RTU may acquire up to 4 analog inputs (2 from the base board and 2 from the expansion).
They have the following features:
Resolution: 14 bits
Precision: 0.1%
1500 Vac isolation from each other and the rest of circuits.
Voltage input: 0÷5 V, 0÷10 V, 1÷5 V, 2÷10 V.
Current input: 0÷20 mA, 4÷20 mA.
Possibility to select loop power supply.
Speed: 5 A/sec..
Protection against overvoltages according to EN61000-4 standard.
Protection against DC overcurrents.
Through the configuration software it is possible to set the input type to acquire (voltage or current)
and the variation range ( 0-5V or 1-5 V, 0-10 V or 2-10 V for voltage signals, 0-20 mA or 4-20 mA
for current signals). Besides it is possible to decide the connection modalities for current inputs: 4
wires (loop power supply disabled) or 2 wires (loop power supply enabled).
2.4 A NALOG I NPUTS F EATURES
Z-RTU may acquire up to 16 digital inputs (8 from the base board and 8 from the expansion board
).
They have the following features:
Internal/external power supply.
1500 Vac isolation from each other and the rest of circuits.
Led indications on the case and on the boards.
Protection from polarity inversion.
Current threshold: 3 mA.
Voltage threshold: 10 V.
Each input handles a16 bits totalizer which allows to make some measuares on the
correspondent digital input. They are separately configurable as counters or for a period measure
on the associated input. If set as counters, they may reach a maximum value of 65535 with
automatic reset in case of overflow. In case of period maesure, they have a resolution of 1ms and
measure digital inputs with frequency up to 100 Hz.
The digital inputs have a common debounce filter (0-250 ms) . So inputs conditions with duration
inferior to the set time, will be ignored (the state and the totalizers will not be modified).
2.5 A NALOG OUTPUTS F EATURES
Z-RTU may funrnish up to 2 analog outputs (1 from the base board and 1 from the expansion
board) .They have the following electrical features:
1500 Vac isolation from each other and the rest of circuits.

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Voltage Output : 0÷10 V.
Current Output: 0÷20 mA.
Protection of the user load in case of fault of the output.
Precision: 0.2%
Response Time: 50 ms
The output type (voltage or current) is set through the apposite dip-switches ( paragraph 4.8 ).
2.6 D IGITAL OUTPUTS F EATURES
Z-RTU manages up to 8 digital outputs ( 4 from the base board, 4 from the expansion board).
4 (+4) SPDT relay contacts (exchange).
Capacity: 5 A-250 Vac.
2500 Vac galvanic isolation of each channel.
Led indication on the case and on the board.
Each output may be configured as stationary or impulsive.
The stationary functioning is the most common where the output follows the correspondent bit.
The impulsive functioning instead allows to activate the output for a period which may be set
through software programming ( 0 to 65535 ms). The output activation occurs on the rising edge of
the correspondent bit, while the deactivation, if anticipated, coincides with the falling edge or the
end of the programmed time, depending on the event which happens before. The impulsive
modality guarantees a greater precision on commanding outputs. Infact the CPU updates the
inputs and the outputs on asynchronous way, with a not costant scanning cycle. So the precision
of the refresh time of the outputs is not guarenteed. For this reason the impulsive functioning mode
has been implemented: if a great precision is required, the activation period and the output
deactivation are fixed unequivocally.
We suppose to have implemented an Isagraf program which pilots the digital output as a square
wave with 1s period and 50% duty cycle. If the output has been configured as stationary, it will
follow the set square wave:

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2.7 P OWER SUPPLY MEASURE
Z-RTU manages through software the measure of the power supply voltage which is available
through a IIC register. The measure is on tenths of Volts with admissible range equal to 100-300
V/10 (10-30 V) and 3% precision.
2.8 F LOATING B ATTERY F EATURES
Z-RTU contains a floating battery to allow the functioning of the system clock and the retentive
memory (236 bytes). Its inserting is set through the apposite dip-switch (Paragraph 4.7), Z-RTU is
normally deliverered with the battery not connected.
The duration of the provided battery has the following features:
•At least 2 years: if Z-RTU is turned off and not supplied.
•Up to 10 years: in case of power supply from the network.
2.9 I NTERNAL M ODEM
Z-RTU may have an internal modem, GSM or PSTN, at customer choice.
GSM Modem: it will be necessary to insert a SIM card and the connection to an antenna to avoid
to damage the modem.
PSTN Modem: it is necessary to use a suitable telephone plag to connect to the phone line. It is
important to underline that the PSTN modem owns a protection system against atmospheric
discharges up to 10 kA.
2.9.1 GSM/GPRS MODEM
The GSM modem has the following features:
Dual band GSM 900/1800 MHz (optional: tri-band )
Data, voice, SMS
Speed up to 57,6 kbps
Full type approval
GPRS class 8 (optional: class 10)
Compliant to GSM phase 2/2+
Sensibiliy better then -102 dBm
2.9.2 PSTN Modem
The PSTN modem has the following compatibility features:
ITU-T V.90/ 56 k,
ITU-T V.34 enhanced, V.34, V.32bis, V.32, V.22bis, V22
Bell 212A e 103/113
ITU-T V.21 & V.23
2.10 S YSTEM P ROTOCOLS
Z-RTU may manage the following protocols:

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•PPP ( Point to Point Protocol ): allows to establish a remote serial connection between
Server and Client.
•HTTP ( HyperText Transfer Protocol ): allows the control, the configuration and the transfer
of files on TCP/IP network, the supervision through OPC Server and OPC Client.
•FTP ( File Transfer Protocol ): allows to perfom operations of upload or download of the
files on the Z-RTU.
•SMTP ( Simple Mail Transfer Protocol ): manages the email sending.
•ModBUS RTU Master / Slave: allows to communicate with I/O modules.
•ModBUS TCP/IP: allows to connect Z-RTU through Ethernet to the local Network.

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3 STRUCTURE AND INTERFACE
On the following figure the structure of Z-RTU is illustrated, with the position of the I/O and
communication ports.
3.1 L ED I NDICATIONS ON Z-RTU
The following indicators are present on Z-RTU, to indicate the state or eventual errors:
•LINK: ( Red ) indicates the state of the ETHERNET link.
OFF: ETHERNET link active.
ON: ETHERNET link absent.
•PWR: ( Green ) indicates the presence of the main power supply.
OFF: main power supply absent.
ON: main power supply present.
•ERR: ( Red ) shows an error or fault on the CPU. It may be ON at the ignition of Z-RTU.
OFF: no errors.
ON/FLASHING: error or fault of the CPU.

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•RUN: (Green ) state of PLC.
FLASHING: PLC (ISaGRAF) program not present
ON: PLC is running.
•GSM: ( Red ) state of GSM connection.
FAST FLASHING: (Period: 1 s and Ton: 0,5 s): Search of the network, not registered o
in turn off phase.
SLOW FLASHING:( Period: 3 s and Ton: 0,35) : Registered and in service.
STEADY ON: optimum link.