Yokogawa S2MMM843-SS1130 N-IO Analog Digital I/O Module
Product Information
Yokogawa S2MMM843-SS1130 is a 16-channel, module-isolated N-IO module for the ProSafe-RS safety control system. It connects mixed field signals to the N-IO node by assigning analog input, analog output, digital input or digital output operation separately to each channel.
Within Yokogawa S2MMM843-SS1130, the SS1130 selection combines standard analog and digital functions with the explosion-protection and ISA G3 wide-temperature options. No more than eight channels operate as analog outputs, while the other channel positions remain available for the supported input or discrete functions.
Yokogawa S2MMM843-SS1130 carries HART communication on channels configured for current input or output. System power feeds the N-IO electronics, and the external 24 V DC field supply feeds connected loops and output loads; a floating field supply preserves the documented separation between system and field ground.
Product Specifications
| Brand | Yokogawa |
|---|---|
| Model | S2MMM843-SS1130 |
| Product Name | N-IO Analog Digital I/O Module |
| Country | Japan (manufacturer) |
| Channel Count | 16, module isolated |
| Selectable Functions | AI, AO, DI or DO per channel |
| Maximum Analog Outputs | 8 channels |
| Analog Current Range | 4 to 20 mA |
| HART Support | Revision 7.3; HART 5, 6 and 7 devices connectable |
| System Power Consumption | 600 mA at 24 V DC maximum condition |
| Field Power Capacity | 11 A at 24 V DC maximum condition |
| Field Supply Range | 24 V DC, -10% / +20% |
| Withstanding Voltage | 1500 V AC for 1 minute between I/O and system |
| Net Weight | Approx. 0.64 kg |
| Software Baseline | ProSafe-RS R4.01 or later |
Flexible Channel Assignment
S2MMM843-SS1130 turns one 16-point N-IO position into a controlled mix of current and discrete functions, but the channel plan must be completed before wiring and power sizing are approved.
Define every channel role
Assign AI, AO, DI or DO to each S2MMM843-SS1130 point in the engineering record before terminal schedules are issued. This keeps cabinet drawings, software tags and commissioning sheets aligned.
Analog output is limited to eight channels, so a proposed mix must be checked against that ceiling instead of assuming all sixteen positions can source 4-20 mA.
Separate signal behaviours
Current input and current output use 40 ms data updates, while discrete input and output paths update in 10 ms. Control logic should not treat those paths as having identical timing.
For analog input, the two-wire or four-wire choice is set per channel. For digital input, dry-contact resistance and the documented response window determine reliable state recognition.
Preserve redundancy intent
A pair of S2MMM843 modules can be installed in a dual-redundant arrangement, but both sides need the same channel assignment, field termination and engineering definition.
Replacement work should compare the full S2MMM843-SS1130 suffix, software release and base-plate position before a spare is accepted as the standby mate.
Power and Diagnostic Boundaries
The mixed-function freedom of S2MMM843-SS1130 moves several design decisions into the power, grounding and field-diagnostic plan.
Size field power from the loads
The 11 A field-power figure represents a maximum digital-output loading condition, not a fixed normal draw. Calculate the actual supply from channel modes, connected loads and expected inrush current.
A floating field supply gives the documented isolation and improved noise immunity. Grounding the field supply connects functional system ground to field ground and changes that isolation condition.
Apply the correct line diagnostics
SCB100 and SCB110 elements are used in different series or parallel positions according to whether a digital input is normally off or normally on. Their polarity and placement belong in the loop drawing.
For analog output, configurable open- and short-circuit detection limits should match the intended load range so a valid loop is not reported as a fault.
Check high-current DO use
A single digital output is rated up to 0.66 A; adjacent channels may be paralleled for documented 1.3 A or 2.0 A arrangements through the external terminal board.
Temperature derating still limits the total module load. Parallel channels therefore require both the individual wiring check and a module-wide current calculation.
Questions & Answers
01How should a mixed-signal replacement be prepared for S2MMM843-SS1130?+
For S2MMM843-SS1130, export the existing channel-mode list, HART assignments, base-plate position and redundancy role before removal; restore that exact map and then verify each field loop independently.
02Why can S2MMM843-SS1130 report unexpected digital-input states after rewiring?+
S2MMM843-SS1130 can misread the intended state when the dry-contact resistance, SCB100/SCB110 placement or polarity does not match the normally-on or normally-off diagnostic design.
03What should be checked when S2MMM843-SS1130 analog output cannot drive a valve?+
For S2MMM843-SS1130, confirm the channel is assigned as AO, the load is within 230 to 600 ohms, field power is present and open/short detection thresholds have not been set against the actual loop.
04Why does a S2MMM843-SS1130 HART device remain invisible while current is present?+
S2MMM843-SS1130 needs the channel in a supported analog mode, one HART device on that channel and a compatible PRM path; also check loop impedance and whether mixed DO activity is delaying HART events.
05Can S2MMM843-SS1130 digital outputs be paralleled without changing the drawing?+
No. S2MMM843-SS1130 parallel-output use requires the documented adjacent-channel terminal arrangement, load-current calculation and temperature derating to be reflected in the external-terminal-board drawing.
06What details should be sent for a S2MMM843-SS1130 quotation?+
For S2MMM843-SS1130, send the complete suffix, quantity, installed base plate, ProSafe-RS release, redundancy use, destination and a clear nameplate photo so the explosion and G3 selections stay attached to the enquiry.
Company Profile
Moore Automation
https://www.mvme.cn
Moore Automation supplies industrial automation components for PLC, DCS, drive, HMI, safety and monitoring systems. Enquiries are organized around the requested manufacturer, complete model, quantity and destination so commercial and shipping details remain in one record.
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