Socomec DIRIS Digiware I-35 AC

Multi-circuit current measurement module

DIRIS Digiware I-35 AC is a three-input current acquisition module in a distributed metering system. It relies on compatible current sensors, shared voltage measurement and a communications gateway. Edge reaches the installed module through that gateway, while the configured load assignment determines which registers describe each circuit.

Socomec DIRIS Digiware I-35 AC
  • Modbus TCP

Multi-circuit current measurement module

Compatibility

Compatible through Modbus TCP

The I-35 AC communication table defines Modbus registers, and the D-50/D-70 quick-start guide documents the Ethernet Modbus TCP gateway and downstream Digiware devices.

Exact I-35 AC reference 48290130, using communication table CMT 1.14.1 through a configured D-50 or D-70 gateway. I-35 MID and I-35 DC are distinct products. The module itself is not an Ethernet meter.

Connect it with

When the Digiware system has a commissioned Ethernet display/gateway

  • Wired
  • Edge
  • Platforms
Multi-circuit current measurement module
Interface
Gateway
Edge
Output
DIRIS Digiware I-35 ACI-35 AC on Digiware bus
D-50 / D-70Digiware display and Ethernet gateway
ZGW-20 GatewayHosts Edge locally
EpiSensor EdgeModbus client + register map
Customer platformMQTT · API · files
Digiware bus
Modbus TCP
Runs locally
Optional onward data
Use the D gateway IP and the installed I-35 device address recorded in its device list. The D gateway is the network endpoint, while the downstream module and load assignment identify the measurements. Do not assume the gateway’s own address is the current module. The customer-platform output is optional; Edge remains the local system of record.

Models

Download
ModelsInterfaceRoute into Edge
I-35 AC, 48290130Three current-sensor inputs; DIN-rail module on Digiware busUse the I-35 AC map and the configured load assignment.
D-50, 48290204 / D-70, 48290203Ethernet gateway with Modbus TCP; D-70 includes WEBVIEW-MThe gateway supplies network access to downstream Digiware devices.
I-35 MID / I-35 DCDifferent certified or DC measurement variantsUse their exact product and communication documents instead of this AC map.

Specifications

A Digiware installation separates voltage acquisition, current acquisition and network access. The I-35 contributes three sensor inputs; a U module supplies voltage measurements and a D gateway provides the illustrated Ethernet path. Map each input to its real circuit before comparing branch loads or aggregating energy.23

Product reference
48290130, I-35 AC2
Current inputs
Three inputs for compatible Socomec current sensors2
Module dimensions
18 × 90 × 65 mm; DIN-rail mounting; IP202
Network endpoint
D-50 or D-70, Ethernet 10/100; Modbus TCP3
D gateway capacity
Up to 32 displayed devices; serial limits depend on configured speed3
Current format in worked check
U32 in mA, high word first; 0xFFFFFFFF means unavailable1
Read boundaries
FC03 requests must remain inside the named communication table1

Interface

Documented measurements and integration boundaries for DIRIS Digiware I-35 AC.

  • Load enable state and timestamp alongside instantaneous measurements.
  • Current per input and configured load, in milliamps in the selected instantaneous table.
  • Signed active power, reactive/apparent power and scaled power factor from their own typed fields.
  • Import/export energy and demand tables where the configured load exposes them.
  • Separate load blocks: the first load is not automatically a total for every connected circuit.

Assessment

Exact I-35 AC reference 48290130, using communication table CMT 1.14.1 through a configured D-50 or D-70 gateway. I-35 MID and I-35 DC are distinct products. The module itself is not an Ethernet meter.

InteroperabilitySupported with conditions
A published map provides functions, point types and unavailable values. Ethernet access depends on a separate commissioned D gateway.13
AccuracyNot yet assessed
The input and data formats are documented, but an accuracy class for the complete installed sensor, voltage-module and current-module chain has not been established in this review.12
SecuritySupported with conditions
The D gateway documents user roles and explicitly calls for default password changes. This does not establish encrypted Modbus transport; restrict the network endpoint.3
ReliabilitySupported with conditions
Load state, timestamps and typed unavailable values support detection of inactive or stale measurements; gateway diagnostics expose downstream communication faults.13
RuggednessSupported with conditions
The I-35 is an IP20 DIN-rail module and the D gateway is specified for indoor use. Enclosure and installation conditions apply to the whole assembly.23
ScalabilitySupported with conditions
The D gateway documents 32 displayed devices, with speed-dependent serial limits. Each module and load still needs an explicit address and point mapping.13
LifecycleSupported with conditions
The current product reference and versioned communication table provide a reproducible selection and setup baseline. Keep the gateway and module revisions with the configuration.12

Setup

Read load 1 current I1

The instantaneous load 1 table in CMT 1.14.1 defines current I1 at decimal 18458. This check does not change the module configuration.

Target
D gateway IP with the configured downstream I-35 AC device address
Function
FC03 Read Holding Registers
PDU start
18458 decimal, 0x481A
Length
2 registers
Decode
U32, high word first; mA converted to A with multiplier 0.001
Independent vector
A simulated 12.345 A is raw 12345 mA = 0x00003039, words 0x0000, 0x3039.
Request PDU
03 48 1A 00 02; the TCP client supplies the transaction header and configured unit ID
Unavailable
0xFFFFFFFF is reserved and must not become 4,294,967.295 A

Acceptance: Check the enabled state and freshness first, then compare with the same load and phase on the D display. This example validates the address and decoder definition; it is not a physical-device qualification.

  1. Inventory the complete Digiware system

    Record I-35 AC reference 48290130, its software version, current sensors, U voltage module and D-50/D-70 gateway. Confirm how each current input is assigned to a load and phase. A module with three inputs is not automatically three independent three-phase meters.

  2. Confirm the downstream device address

    Use the D gateway’s device list and diagnostics to identify the I-35 address and check that Digiware communication is healthy. Record the gateway IP and configured Modbus TCP endpoint. Preserve the installed addressing rather than running discovery changes on an operational system.

  3. Read the load state first

    Use the I-35 AC map for the installed revision. Check that load 1 is enabled and that its last instantaneous timestamp is current before interpreting its measurements. An inactive or stale load can produce an invalid comparison even when the TCP read succeeds.

  4. Verify one current measurement

    Read FC03 at PDU address 18458 (0x481A), two registers, for load 1 current I1. Decode unsigned 32-bit, high word first, then convert mA to A with multiplier 0.001. Reject 0xFFFFFFFF as unavailable. Compare against the same load and phase on the D display.

  5. Add other tables deliberately

    Keep each request inside a named table. Load 2 and load 3 use different blocks; power, energy and timestamps also have different types and units. Verify each point definition before aggregating circuits, and preserve missing/stale states separately from measured zero.

Common questions

Can the I-35 connect directly to Ethernet?
The I-35 is a Digiware current module. The illustrated network connection uses a D-50 or D-70 display/gateway with an Ethernet Modbus TCP service. Do not assign the D gateway’s hardware interfaces to the I-35 itself.3
Why is current a thousand times too high?
The selected load table reports U32 current in mA. Multiply by 0.001 to display A. Other fields use different units and factors; do not apply the current multiplier to power or energy.1
Why does the decoder show a huge current?
All bits set, 0xFFFFFFFF, is the documented U32 unavailable sentinel. Reject it before scaling. Also check that the load is enabled and its timestamp is fresh.1
Can I read across two tables in one request?
The communication table forbids a request crossing table boundaries. Group points only inside a named table, even if nearby addresses look contiguous.1

Sources

  1. DIRIS Digiware I-35 AC communication table, CMT 1.14.1 (opens in a new tab) Socomec
  2. DIRIS Digiware I-35 reference 48290130 (opens in a new tab) Socomec
  3. DIRIS Digiware D-50 / D-70 quick-start guide, 549829 (opens in a new tab) (PDF) Socomec

Further reading

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