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Yokogawa AAI835-S50/K4A00 / AAI135-S50/K4A00 Isolated Current I/O and Current Input Modules Item NO.: 2932309

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Product Name	Yokogawa AAI835-S50/K4A00 / AAI135-S50/K4A00 Isolated Current I/O and Current Input Modules
Item NO.	2932309
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	YOKOGAWA
Brand	YOKOGAWA
Creation Time	2026-11-13

YokogawaISOLATED CURRENT I/O

Yokogawa AAI835-S50/K4A00 / AAI135-S50/K4A00Isolated Current I/O and Current Input Modules

Product Summary

Yokogawa AAI835-S50/K4A00 provides four isolated 4 to 20 mA inputs and four isolated 4 to 20 mA outputs, while Yokogawa AAI135-S50/K4A00 provides eight isolated 4 to 20 mA inputs. Both modules support HART communication and belong to the isolated current-channel group.

In AAI835-S50/K4A00 and AAI135-S50/K4A00, S identifies the standard type, 5 identifies non-explosion construction and 0 identifies the basic environmental specification. The two models share a 10 ms update period and 0.3 kg approximate weight, but their channel direction and count are not interchangeable.

The /K4A00 option on AAI835-S50/K4A00 and AAI135-S50/K4A00 specifies the ATK4A-00 KS cable interface adapter. The same adapter family presents different signal maps: four inputs plus four outputs for AAI835 and eight inputs for AAI135.

Yokogawa AAI835-S50/K4A00 and AAI135-S50/K4A00 isolated current I/O specification table from the official manual

Technical Details

Specification	AAI835-S50/K4A00	AAI135-S50/K4A00
Brand	Yokogawa	Yokogawa
Product Name	4-Input / 4-Output Isolated Current I/O Module	8-Channel Isolated Current Input Module
Country	Not specified	Not specified
Input channels	4 isolated channels	8 isolated channels
Output channels	4 isolated channels	None
Signal	4 to 20 mA input and output	4 to 20 mA input
Allowable input current	25 mA	25 mA
Output load resistance	0 to 750 ohm	Not applicable
Circuit-open detection	Less than 0.65 mA on output	Not applicable
Accuracy	Input ±16 µA; output ±48 µA	Input ±16 µA
Data update period	10 ms	10 ms
HART communication	Available	Available
Isolation	Channel-to-system and channel-to-channel	Channel-to-system and channel-to-channel
Connection option	ATK4A-00 KS adapter	ATK4A-00 KS adapter
Approximate weight	0.3 kg	0.3 kg

Product Functions

AAI835-S50/K4A00 / AAI135-S50/K4A00 share isolated current-input technology but serve different channel plans: mixed current I/O versus input-only acquisition.

Four-by-four current I/O

AAI835-S50/K4A00 combines four current inputs with four current outputs, supporting measurement and actuation within one isolated module.

Eight current inputs

AAI135-S50/K4A00 allocates all eight channels to current input, increasing acquisition density without output circuits.

Shared HART access

Both models can exchange HART information with supported field devices while the primary 4 to 20 mA values remain available to control blocks.

System Integration

AAI835-S50/K4A00 / AAI135-S50/K4A00 can share adapter and node conventions, yet the project database must preserve the different channel direction and count.

Choose the correct channel plan

Select AAI835 when four outputs are required; select AAI135 when all eight channels are inputs. Do not base the choice on faceplate similarity.

Retain the KS interface

Both complete models specify /K4A00 and therefore the ATK4A-00 KS adapter, which must match the installed cable map.

Map HART devices by channel

Associate every HART identity with its actual input or output channel so the FIO node, adapter position and control-system point use the same signal direction.

Customer Questions

Q01HART data is missing from AAI835-S50/K4A00 / AAI135-S50/K4A00; which path should be isolated?

For AAI835-S50/K4A00 / AAI135-S50/K4A00, verify the field device, channel assignment, HART-capable node environment, wiring quality and engineering database before replacing the module.

Q02Can the same ATK4A-00 adapter map be copied between AAI835-S50/K4A00 / AAI135-S50/K4A00?

AAI835-S50/K4A00 / AAI135-S50/K4A00 both use /K4A00, but their channel functions differ. Use the model-specific terminal map rather than copying the same logical assignment.

Q03How do AAI835-S50/K4A00 / AAI135-S50/K4A00 differ when a current circuit opens?

On AAI835-S50/K4A00 / AAI135-S50/K4A00, first identify whether the point is an AAI835 output or an input channel; output open-circuit behavior and input signal loss require different loop checks.

Q04Why does only one loop fail on AAI835-S50/K4A00 / AAI135-S50/K4A00?

The isolated channels in AAI835-S50/K4A00 / AAI135-S50/K4A00 can confine a field wiring, supply or device problem to one loop. Check that loop before assuming a node-wide defect.

Q05Why is an output channel unavailable after AAI835-S50/K4A00 / AAI135-S50/K4A00 hardware is exchanged?

If AAI835-S50/K4A00 / AAI135-S50/K4A00 was interchanged, confirm that an input-only AAI135 was not installed where an AAI835 output channel was engineered.

Q06Which engineering map prevents AAI835-S50/K4A00 / AAI135-S50/K4A00 from being assigned the wrong channel direction?

For AAI835-S50/K4A00 / AAI135-S50/K4A00, compare the module slot, ATK4A-00 terminal map, point direction and HART device list so the four-by-four and eight-input layouts remain distinct.

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