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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.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 108 109

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