Impulse 463E - Manual (Page 41)

© Sealevel Systems, Inc. - 38 - SeaI/O User Manual
SeaI/O Architecture
The memory map for the I/O listed in the table below describes how to address the
SeaI/O modules in both Modbus compliant applications as well as through the
SeaMAX API library.
SeaI/O
Model
Type No.
Modbus
Function
Modbus
Range
Access
410 Reed Relays 16 0x01 0 – 15 Bit
Opto. Inputs 16 0x02 0 – 15 Bit
420 Form C Relays 8 0x01 0 – 7 Bit
Opto. Inputs 16 0x02 0 – 15 Bit
430 Opto. Inputs 32 0x02 0 – 31 Bit
440 Reed Relays 32 0x01 0 – 31 Bit
450 Form C Relays 16 0x01 0 – 15 Bit
462 Programmable I/O 96 0x41
0x42 – –
463 Programmable I/O 96 0x41
0x42 – –
470 Outputs 8 0x01 0 – 7 Bit
Opto. Inputs 8 0x02 0 – 7 Bit
D/A Outputs 2 0x06 0 – 1 16 Bits
A/D Inputs 16 0x04 0 – 15 16 Bits
520 Form C Relays 8 0x01 0 – 7 Bit
Opto. Inputs 8 0x02 0 – 7 Bit
When communicating with SeaI/O modules, the users needs to be aware of the
following:
When accessing multiple I/O points, they must be addressed linearly.
The output memory space is separate from the input I/O space; therefore
individual reads must be issued for each type of I/O (i.e., a 16-input and 16-
output module has two unique spaces. A program that wants to read all 32 digital
I/O points must issue two sixteen position reads for each I/O space).
In terms of Modbus, digital outputs are mapped into coil space and digital inputs
are mapped into discrete input space.