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The addressing utilises standard Modbus protocol formatting as well as being common
for ELPRO protocol.
The following table shows the basic onboard I/O available in a standard 915U-2 module
with no expansion I/O connected. For a more detailed I/O map (showing the full register
range), see Appendix B: "I/O Store Registers" at the end of the manual.
4.6.1 Standard 915U-2 I/O (Basic I/O)
Address
Input / Output Description
0001 - 0008
Local DIO1 – DIO8 (as Outputs)
10001 - 10008
Local DIO1 – DIO8 (as inputs)
Setpoint status from Analog inputs 1 through 12. (AI1, 2, 3, 4
10009 - 10020
Current Mode), (Internal Supplies), (AI1, 2, 3, 4 Voltage Mode)
Local AI1 – AI4. (Current Mode)
30001 - 30004
( AI1, AI2 4-20mA diff, AI3, AI4 4-20mA Sink)
30005
Local Supply voltage (8-40V default scaling)
30006
Local 24V loop voltage (8-40V default scaling)
30007
Local Battery voltage (8-40V default scaling)
115S Expansion I/O Supply Voltage (8-40V default scaling)
30008
Local AI1 – AI4. (Voltage Mode) ( AI1, AI2 0-10V, AI3, AI4 0-5V)
30009 - 30012
30013 - 30016
Local Pulse rate inputs PI1 – PI4
Local Pulsed input counts – (PI1 Most significant word is 36001 and
36001 - 36008
Least significant word is 36002)
38000 - 38021
Local Analog inputs as Floating point values (mA, Volts or Hz)
40001 - 40002
Local AO1 – AO2
48001 - 48002
Local AO1 – AO2 as floating point values (mA)
4.7 Serial Expansion I/O
4.7.1 Adding modules
Additional 115S serial expansion I/O modules can be added if more I/O is required.
When connecting expansion I/O module to the 915U-2 the RS485 serial port is
configured to communicate ELPRO protocol by default.
The default serial parameters of the RS485 port are 19200, N, 8, 1 which match the
defaults of the 115S serial expansion modules. The parameters can be changed, to
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915U-2 Wireless I/O
915U-2 Wireless I/O
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