Elpro Technologies 115S User manual

115S Serial I/O Module
User Manual
ELPRO Technologies Pty Ltd, 9/12 Billabong Street, Stafford Q 4053, Australia.
Tel: [phone] Fax: [phone] Email: [email protected]
Web: www.elprotech.com

115S Serial I/O Module User Manual
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Thank you for your selection of the 115S Serial I/O Module. We trust it will give you
many years of valuable service.
ATTENTION!
Incorrect termination of supply wires may cause internal damage and will void
warranty.
To ensure your 115S product enjoys a long life,
Double check ALL your connections with the User Manual, before
turning the power on.
All equipment must be properly grounded for safe operation.
All equipment should be serviced only by a qualified technician.
Important Notice
ELPRO products are designed to be used in industrial environments, by experienced
industrial engineering personnel with adequate knowledge of safety design
considerations. These products should not be used in non-industrial applications, or
life-support systems, without consulting ELPRO Technologies first.
Installation and Operating Instructions:
The Expansion I/O modules are to be installed by trained personnel / licensed
electricians only and installation must be carried out in accordance with the
instructions listed in the Installation Guide and applicable local regulatory codes.
The units are intended for Restricted Access Locations.
The Expansion I/O modules are intended to be installed in a final enclosure, rated
IP54, before use outdoors.
The Equipment shall be powered using an external Listed Power Supply with LPS
outputs or a Class 2 Power Supply.
Hazardous Location Notices:
This device complies with
Ex nL IIC. T6 -40 C <= Ta <= +60 C
WARNING: EXPLOSION HAZARD.
Do not disconnect equipment unless power has been switched off or the area is
known to be non-hazardous.

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Limited Lifetime Warranty, Disclaimer and Limitation of Remedies
ELPRO products are warranted to be free from manufacturing defects for the
“serviceable lifetime” of the product. The “serviceable lifetime” is limited to the
availability of electronic components. If the serviceable life is reached in less than three
years following the original purchase from ELPRO, ELPRO will replace the product with
an equivalent product if an equivalent product is available.
This warranty does not extend to:
- failures caused by operation of the equipment outside the particular product's
specification, or
- use of the module not in accordance with this User Manual, or
- abuse, misuse, neglect or damage by external causes, or
-repairs, alterations, or modifications undertaken other than by an authorized
Service Agent.
ELPRO’s liability under this warranty is limited to the replacement or repair of the
product. This warranty is in lieu of and exclusive of all other warranties. This warranty
does not indemnify the purchaser of products for any consequential claim for damages or
loss of operations or profits and ELPRO is not liable for any consequential damages or
loss of operations or profits resulting from the use of these products. ELPRO is not liable
for damages, losses, costs, injury or harm incurred as a consequence of any representations,
warranties or conditions made by ELPRO or its representatives or by any other party,
except as expressed solely in this document.

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CONTENTS
1OVERVIEW............................................................................................................... 5
1.1 MODULE TYPES AND FEATURES.........................................................................................7
1.1.1 Digital inputs / outputs............................................................................................7
1.1.2 Pulsed outputs.........................................................................................................7
1.1.3 Pulsed inputs...........................................................................................................8
1.1.4 Analog inputs..........................................................................................................8
1.1.5 Analog outputs........................................................................................................9
1.1.6 Communications...................................................................................................10
2INSTALLATION..................................................................................................... 11
2.1 GENERAL INSTALLATION .................................................................................................11
2.1.1 Power Connection.................................................................................................11
2.1.2 Address Switches..................................................................................................12
2.2 SIGNAL CONNECTIONS.....................................................................................................13
2.2.1 Digital Inputs (and Pulsed Inputs)........................................................................13
2.2.2 Digital Outputs (and Pulsed Outputs)...................................................................14
2.2.3 Analog Inputs........................................................................................................14
2.2.4 Analog Outputs.....................................................................................................18
3CONFIGURATION................................................................................................. 21
3.1 ELPRO EXPANSION I/O CONFIGURATION. ......................................................................21
3.2 MODBUS SLAVE CONFIGURATION.................................................................................23
4HARDWARE CONFIGURATION........................................................................ 24
4.1 CONNECTING TO THE 115S MODULE................................................................................24
4.2 CONFIGURATION COMMON TO ALL MODULES .................................................................25
4.2.1 Communications...................................................................................................25
4.2.2 Modbus Output Timeout on Comms fail..............................................................26
4.2.3 Configurable ACK Timeout .................................................................................27
4.2.4 Pulsed outputs.......................................................................................................28
4.3 115S-11 CONFIGURATION ................................................................................................29
4.3.1 Pulsed Inputs.........................................................................................................29
4.4 115S-12 CONFIGURATION ................................................................................................30
4.4.1 Voltage input ........................................................................................................30
4.4.2 Current input.........................................................................................................33
4.5 115S-13 CONFIGURATION ................................................................................................36
4.5.1 Voltage output ......................................................................................................36
4.5.2 Current output.......................................................................................................38
5OPERATION............................................................................................................ 40
5.1 115S-11 MODULE .............................................................................................................40
5.2 115S-12 MODULE .............................................................................................................41
5.3 115S-13 MODULE .............................................................................................................43
5.4 HEXADECIMAL REPRESENTATION OF VOLTAGE AND CURRENT LEVELS..........................45
APPENDIX A. MODBUS ADDRESS MAP................................................................. 46
A.1. 115S-11...............................................................................................................................46
A.2. 115S-12...............................................................................................................................48
A.3. 115S-13...............................................................................................................................50
APPENDIX B. MODBUS FUNCTIONALITY............................................................ 52
APPENDIX C. COMMS RECOVERY ........................................................................ 53

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APPENDIX D. SPECIFICATIONS.............................................................................. 55
APPENDIX E. RS232 WIRING.................................................................................... 57
1 Overview
The ELPRO 115S modules are designed to provide I/O expansion for other ELPRO
products like 105U and 905U modules. The 115S modules support the ELPRO E-Series
protocol, and communicate serially via RS232 or RS485. Configuration is done via the
ELPRO E-Series configuration utility.
The 115S modules also support MODBUS protocol. They may be used as a MODBUS
slave with any 3rd-party MODBUS device, or with the ELPRO 105U-G or 905U-G
modules using MODBUS. They support both MODBUS ASCII protocol, and serial un-
signed MODBUS RTU, also known as “MODBUS binary”. The Modbus slave address of
the 115S is selected via two rotary switches on the bottom panel of the case.
All 115S models provide digital inputs and outputs. Specific models provide analog
inputs or analog outputs. Pulsed inputs and pulsed outputs are also available. Several
modules may be connected to one master, allowing any combination of I/O types.
Figure 1-1 shows a diagram of a 115S module with parts labelled.

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Figure 1-1: 115S unit with significant parts labeled.
Two ports allow configuration and communications on the 115S. The RS232 port is
intended for configuration. The RS485 port allows the unit to be in a multi-drop
configuration.
Overvoltage protection and supply monitoring is provided to minimize the risk of failure
due to faulty connections or supply surges.
I/O connector
Status LEDs
RS485 and
power connector
RS232 configuration
connector
Address switches
DIN rail mount
Analog
configuration
access panel
Power
OK
Transmit
Receive
RS485
termination
switch

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1.1 Module types and features
The module types and I/O are summarised in Table 1-1.
115S -11 -12 -13
Digital inputs/outputs 16 8 8
Pulse outputs 8 8 8
Pulse inputs 4 - -
Analog inputs - 8 -
Analog outputs - - 8
Table 1-1: Summary of 115S module types and I/O.
1.1.1 Digital inputs / outputs
Each digital I/O channel on the 115S modules can act as either an input or an output. The
input/output direction does not need to be user configured.
Digital inputs are suitable for voltage-free contacts, or NPN-transistor switch devices.
Digital outputs are open-collector transistor outputs, able to switch loads up to 30VDC,
200mA.
If you have wired an input/output channel as an input, it is recommended that you do not
write values to it as an output. No electrical damage will occur if you attempt to use a
channel wired as an input as an output, or vice-versa, however the I/O system will not
operate correctly.
We recommend that the required digital inputs be assigned consecutively from channel 1.
Then use the remaining channels as digital outputs.
1.1.2 Pulsed outputs
The first eight digital channels on each 115S module can be used as pulse outputs. The
maximum output frequency is 50Hz.
A pulse output on the 115S will output the number of pulses equal to the register value
sent by the master. When the master sends a new register value, the 115S will output
additional pulses until the output count is the same as the new value.
Three register values are associated with creating each pulsed output:
•The Count keeps a tally of how many pulses have been output - this is a 16-bit
register and overflows to 0.
•The Target is set by the master, and is the trigger for pulses to be created. The
digital channel outputs pulses until the Count value reaches the Target value. If
the Target register is set to 0, the pulses stop and the Count register is cleared.

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•The Update Time is the interval in which the 115S expects to receive updates to
the Target value. The module will output enough pulses for the Count to reach the
Target within the update time. The output pulse rate is determined by the update
time, and the difference between the count and the target.
If the calculated pulse rate is more than the maximum rate (50Hz), the 115S will output
pulses at the maximum rate. At the end of the update time, the count value will be less
than the target. The 115S will then calculate the new required pulse rate for the next
update period, based on the difference between Count and Target values.
If the calculated pulse rate is greater than around three times the maximum rate, pulses
are not output. The Count value will be set to the value of the Target without any pulses
output. Pulses will be output again when the calculated pulse rate falls within the
maximum possible rate.
1.1.3 Pulsed inputs
The first four digital channels on the 115S-11 module can be used as pulsed inputs. The
maximum input pulse frequency is 1 KHz.
The pulse input channel calculates two register variables, each of which can be read by
the Modbus master.
•The Pulse Count is a count of the pulses detected on the channel since the 115S
powered up. The pulse input counts are 32-bit values (2 x 16-bit registers, a low and
a high register), and wrap around to zero on overflow.
•The Pulse Rate is a measure of the rate of pulses detected on the channel. The pulse
rate value is decimal 16,384 (hex 4000) for zero rate and decimal 49,152 (hex C000)
for the maximum rate configured by the user. These zero and maximum values are
the same as 0% and 100% used for analog values. (See section 5.4 for hex to decimal
conversion.)
The maximum pulse input rate is set during configuration. The value is in pulses per
minute and is limited to 60000 (1 KHz), the maximum rate capable of the module.
1.1.4 Analog inputs
The analog inputs on the 115S-12 can be connected as either grounded single-ended
inputs or as floating differential inputs. The 115S-12 has eight grounded inputs or four
floating inputs.
•Grounded single-ended inputs connect between the AIN terminal and the GND
terminal.
•Floating differential inputs each take up two terminals. There are four differential
pairs on the 115S-12: [AIN1-AIN2], [AIN3-AIN4], [AIN5-AIN6], [AIN7-AIN8]. For

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example, the first input is connected to terminals AIN1 (positive) and AIN2
(negative).
The two types of input cannot be mixed - all inputs must be either “grounded” or
“floating”.
Inputs can also be selected as mA current, or voltage input - all inputs must be the same,
either all current or all voltage. The scale of each analog input is chosen during hardware
configuration, with scale options as follows:
Voltage input scale options: [0 to 5V], [0 to 10V], [1 to 5V]
Current input scale options: [0 to 10mA], [0 to 20mA], [4 to 20mA]
For compatibility with E-Series modules, 4-20mA current is recommended. See section
4.4 for more information on compatibility.
The values on the analog input are decimal 16,384 (hex 4000) for minimum signal (0%)
and decimal 49,152 (hex C000) for maximum (100%).
The analog channel will measure over-scale, up to 150% which will have value 65,536
(hex FFFF). For 4-20mA signals, the channel will measure under-scale down to 0mA
which has a value of 8,192 (hex 2000). (See section 5.4 for hex to decimal conversion.)
The 115S-12 provides a 24V analog loop supply (“ALS”) for powering analog loops.
1.1.5 Analog outputs
The 115S-13 has eight analog output channels and can be configured to output voltage or
current. For current signals, “source” or “sink” can be selected. The scale of each analog
output is specified during configuration, with scale options as follows:
Voltage output scale options: [0 to 5V], [0 to 10V], [1 to 5V]
Current output scale options: [0 to 10mA], [0 to 20mA], [4 to 20mA], source or sink
•Voltage outputs are measured with respect to the ground terminal.
•Current source outputs are measured with respect to the ground terminal.
•Current sink outputs are measured with respect to the 24V “ALS” terminal.
Writing to the output register by the master produces the analog output. Minimum to
maximum signals (0 – 100%) are produced by register values from decimal 16,384 to
49,152 (hex 4000 - C000). (See section 5.4 for hex to decimal conversion.)
The analog channel can output over-scale, up to 150% corresponding to register value
65,536 (hex FFFF). For 4-20mA signals, the channel can output under-scale down to
0mA from a register value of 8,192 (hex 2000) or less. Note that the over-scale output is
limited by the maximum levels capable of the 115S module (12V or 24mA).

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1.1.6 Communications
The 115S modules have two communication ports: RS232 and RS485. The RS485 port
communicates using E-Series protocol. Both ports support Modbus protocol.
The RS232 port is intended for configuration. The RS485 port is intended for normal
operation and can be used in a multi-drop setup.
There are two address switches on the base of the module. When the switches are set
within the range 01-99, the module uses Modbus protocol on the RS485 port, with the
Modbus address defined by the switches. Setting both address switches to 00 configures
the module to use E-Series protocol on the RS485 port. Whenever these address switches
are changed the unit should be reset by disconnecting power.
Note - When configured for E-Series protocol the maximum number of expansion
modules per radio is 10 as each module requires 3 addresses.
When using E-Series protocol, the port settings are fixed at 9600 baud, 8 data bits, no
parity, 1 stop bit.
The Modbus communications settings are configurable as follows:
Modbus type: RTU, ASCII with 8 data bits, ASCII with 7 data bits. (Note that the
configuration software only supports Modbus RTU. A Modbus Master can select ASCII
protocol by writing to the appropriate register. See Appendix A.)
Baud rate: 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, 115200
Parity: none, odd, even
Stop bits: 1 or 2.
The modules are fitted with a termination switch for the RS485. Set this switch only on
the last module in a multi-drop RS485 configuration.
The ELPRO E-Series software is used to configure the 115S modules as part of an
E_Series network. The hardware set-up for items such as expected pulse rates and analog
signals is also available through this software.
When used as a Modbus-only device, stand-alone configuration software
(cfg_115S_Vx.xx.exe) is available to set up the modules. All required software may be
downloaded from the ELPRO website.

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2 Installation
All connections to the module should be SELV only. Normal 110/220/240V mains
supply should not be connected to any input terminal of the module.
2.1 General installation
Several 115S modules may be connected to one Master / E-Series Radio via RS485
multi-drop connection as shown in Figure 2-1. Ensure there are good connections
between the 115S units and the master and a separate Earth connected to the ‘GND’
terminal on the front Terminal block of each module. 2.5 sqmm / 12 gauge earth wire is
recommended.
Figure 2-1: Several 115S units connected to a master.
2.1.1 Power Connection
The 115S modules require a 10.8-30 VDC ** power supply. This is supplied to the 4-way
connector, shown in Figure 2-2.
** Model Dependent. Check rear label for actual operating voltages
Figure 2-2: Power and RS485 connector.
Connect 10.8-30 VDC to + and earth to -. Connect RS485 to B and A.
B A -+

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2.1.2 Address Switches
The address switches are found on the bottom panel of the module, as shown in Figure
2-3. If you are using the 115S module with other ELPRO E-Series modules (ELPRO 105
and 905- modules), the address switches must be set to “00”. This enables ELPRO
protocol mode and assigns 3 serial addresses to each module.
If you are using a Modbus Master device, ensure each 115S connected to the same
Modbus master has a unique Modbus address.
Note that the module must be reset after changing the address switches.
You can connect to an ELPRO 105U-G-MD1 or 905U-G-MD1 Module using either
MODBUS protocol or ELPRO protocol. ELPRO protocol is easier to set up, and we
recommend using this protocol for most applications.
Figure 2-3: Address switches. The address shown is 01.
Connect the RS485 B and A wires to the 4-way connector shown previously in Figure
2-2. An RS485 termination switch is provided. Terminate the last 115S module in the
multi-drop setup as shown in Figure 2-4.
Figure 2-4: RS485 multi-drop connection and termination (only use external
termination for the master if it does not have internal termination).
x10 x1
ON
RS485
termination
switch.
Up = terminate
Down = unterminated
Master
115S
115S
115S
A
B
A
B
A
B
A
B
Termination
switch up
(terminated)
120Ω

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2.2 Signal Connections
All connections to the module should be SELV only. Normal 110/220/240V mains
supply should not be connected to any input terminal of the module.
2.2.1 Digital Inputs (and Pulsed Inputs)
The 115S-11 supports 16 digital signals, and the 115S-12 and 115S-13 support 8 digital
signals. Additionally, digital inputs DIO1-4 on the 115S-11 operate as pulse inputs.
Digital output signals share the same terminals as the Digital input signals, marked DIO1-
8, and DIO1-16 on the 115S-11 module.
A digital input is activated by connecting to EARTH, either by voltage-free contact or by
a transistor switch. Refer to Figure 2-5:
Figure 2-5: Connection of digital inputs.
Voltage-free contact
Transistor
switch device
V+
V+
V-
DIO1
DIO2
EARTH
115S Module

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2.2.2 Digital Outputs (and Pulsed Outputs)
The 115S-11 supports up to 16 digital outputs, shared with the digital input function on
the same terminals. The 115S-12 and 115S-13 both provide 8 digital output signals.
These signals are marked DIO1-8, and DIO1-16 for the 115S-11. On all 115S modules,
DIO1-8 can also operate as pulsed outputs.
When active, digital outputs provide a transistor switch to EARTH. To connect a digital
output, refer to the diagram in Figure 2-6. A bypass diode is recommended to protect
against switching surges for inductive loads such as relay coils.
Figure 2-6: Connection of digital outputs.
Note that digital outputs will only switch DC circuits, with maximum voltage 30VDC.
2.2.3 Analog Inputs
The 115S-12 provides eight grounded single-ended or four floating differential analog
inputs. These provide measurement of voltage signals (0-10V) or current (0-20 mA)
signals. An internal 24V analog loop supply (ALS) is generated for current loops.
Refer to Section 4.4 for detail on configuring single-ended, differential, current-mode or
voltage mode inputs.
2.2.3.1 Grounded Single-Ended mA Inputs
Single-ended current inputs allow twice as many inputs as the differential mode. This
mode is useful when the sensor loop can be grounded to the 115S module. Devices may
also be powered by the 24V supplied by the 115S. Refer to Figure 2-7:
_
+
DC
Load
Max 30VDC
0.2A
V-
DIO1
DIO2
EARTH
115S Module

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Figure 2-7: Connection for single-ended current inputs. Transducers may be
externally powered or powered by the 115S +24V loop supply.
Note:
-The module is configured at the factory for this type of input
-To change the input configuration, refer to section 4.4
WARNING !
Ensure correct DIP switch positions AND software configuration has been
completed for each analogue input BEFORE connecting external signals to the
115S-12 module.
V-
AIN1
AIN2
AGND
115S-12 Module
ALS +24V
Loop powered
sensor
Externally powered
sensor
+
-
+
-

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2.2.3.2 Floating Differential Mode mA Inputs
Differential mode current inputs should be used when measuring a current loop which
cannot be connected to earth or ground. This allows the input to be connected anywhere
in the current loop. Common mode voltage can be up to 27VDC.
Up to four loops can be connected, to terminal pairs [AIN1-AIN2], [AIN3-AIN4],
[AIN5-AIN6], [AIN7-AIN8] - the former terminal is +ve and the latter –ve.
The diagram in Figure 2-8 indicates how to connect devices for differential mode current
inputs.
Figure 2-8: Connections for differential current inputs.
Note:
-The module configuration needs to be changed for this type of input
-To change the input configuration, refer to section 4.4
WARNING !
Ensure correct DIP switch positions AND software configuration has been
completed for each analogue input BEFORE connecting external signals to the
115S-12 module.
V-
AIN3
AIN4
AGND
115S-12 Module
ALS +24V
Externally powered
sensor
+
-
AIN1
AIN2
+
-
Loop powered
sensor
Power
supply

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2.2.3.3 Floating Differential Voltage Inputs
Differential voltage inputs allow a voltage to be measured when it cannot be referenced
to earth or ground. The diagram in Figure 2-9 shows how to connect differential voltage
inputs. The module has a 27V common mode input range.
Figure 2-9: Connection for differential voltage input mode.
Note:
-The module configuration needs to be changed for this type of input
-To change the input configuration, refer to section 4.4
WARNING !
Ensure correct DIP switch positions AND software configuration has been
completed for each analogue input BEFORE connecting external signals to the
115S-12 module.
2.2.3.4 Single-ended Voltage Input
Single-ended voltage inputs allow twice as many inputs as differential mode. This mode
is useful when one end of the input voltage can be connected to the ground of the 115S
module. Figure 2-10 shows connections for single-ended voltage input.
V-
AIN3
AIN4
AGND
115S-12 Module
ALS +24V
Sensors with
voltage signals
AIN1
AIN2
+
-
+
-

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Figure 2-10: Connection for single-ended voltage input.
Note:
-The module configuration needs to be changed for this type of input
-To change the input configuration, refer to section 4.4
WARNING !
Ensure correct DIP switch positions AND software configuration has been
completed for each analogue input BEFORE connecting external signals to the
115S-12 module.
2.2.4 Analog Outputs
The 115S-13 provides eight analog outputs. These may be configured as voltage or
current outputs. The current output may be selected as “sink” or “source” current.
Refer to Section 4.5 for detail on configuring analog outputs.
2.2.4.1 Current Output
Current output mode may be configured for current source or current sink. Figure 2-11
shows the connections for current source mode. Figure 2-12 shows the connections for
current sink.
V-
AIN1
AIN2
AGND
115S-12 Module
ALS +24V
Sensor with voltage
signal
+
-

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Figure 2-11: Connection for current source output.
Note:
-The module is configured at the factory for this type of output connection
-To change the input configuration, refer to section 4.5
Figure 2-12: Connection for current sink output.
Note:
-The hardware configuration needs to be changed for this type of output
connection
-To change the hardware configuration, refer to section 4.5
V-
AOT1
AOT2
AGND
115S-13 Module
ALS +24V
PLC
AI+
AI-
V-
AOT1
AOT2
AGND
115S-13 Module
ALS +24V
PLC
AI
COM
+
-
+
-

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2.2.4.2 Voltage Output
Voltage output mode produces a voltage referenced to the module’s AGND. Figure 2-13
shows the connection for voltage output configuration.
Figure 2-13: Connection for voltage output configuration.
V-
AOT1
AOT2
AGND
115S-13 Module
ALS +24V
PLC
VOLTAGE
INPUT
AI
COM
+
-