115S I/O Expansion Products

Key Features:

The ELPRO 115S series is designed to allows end users expand input and output count or act as a Modbus® slave I/O to connect other field devices which accommodate the change in  I/O as the project needs evolve. It can be used with ELPRO transceiver-based I/O, gateway, Ethernet, and serial products.

•    Provides several I/O port variations for expanding applications
•    Combine units (daisy chain) to accommodate additional I/O needs
•    Serial modem expansion I/O for ELPRO transceiver I/O, gateway, and Ethernet products
•    Modbus RTU slave I/O expansion capability

Product Details

Input and Output

Digital input and output
115S-11: up to 16
115S-12: up to 8
115S-13: up to 8

Analog input
115S-11: 0
115S-12: 4 floating/8 commoned (0–20 mA/0–10V)
115S-13: 0

Analog output
 115S-11: 0
115S-12: 0
115S-13: 8 sink/source (0–20 mA/0–10V)

Pulse input
115S-11: 4 (first four DI only) (maximum rate 1 kHz)
115S-12: 0
115S-13: 0

Pulse output
115S-11: 8
115S-12: 8
115S-13: 8

Serial Port

RS-232 9-pin DB-9 female connector DCE (Modbus only)
RS-485 2-pin terminal block, non-isolated Modbus and ELPRO protocol
Data rate (bps) 1200 bps, 115.2 kbps (defaults, configurable)
Serial settings  7/8 data bits, stop/parity (configurable)


EMC FCC Part 15; CE; EN 55022; EN 55024
Hazardous area UL Class I Div 2, IECEx nA IIC, ATEX Zone 2
Safety EN 60950

Power Supply

Nominal supply 10.8–30 Vdc, under/over voltage protection
Average current draw 150 mA @ 12V, 90 mA @ 24V
Analog loop supply
Internal DC/DC converter: 24 Vdc
115S-12: max. 270 mA @ 24 Vdc
115S-13: max. 160 mA @ 24 Vdc

LED Indication and Diagnostics

LED indication Power, OK, RX, TX, I/O status Refer to product manual for further information


Temperature rating –40 to +140°F (–40 to +60°C)
Humidity rating 0–99% RH noncondensing