diff --git a/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasDriver.cs b/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasDriver.cs
index a233f294..bbf4d0e9 100644
--- a/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasDriver.cs
+++ b/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasDriver.cs
@@ -1307,8 +1307,8 @@ public sealed class FocasDriver : IDriver, IReadable, IWritable, ITagDiscovery,
                 "Program/MainNumber" => state.LastProgramAxisRef?.MainProgramNumber,
                 "Program/Sequence" => state.LastProgramAxisRef?.SequenceNumber,
                 "OperationMode/Mode" => state.LastProgramInfo?.Mode,
-                "OperationMode/ModeText" => state.LastProgramInfo is { } pi
-                    ? FocasOpMode.ToText(pi.Mode) : null,
+                "OperationMode/ModeText" => state.LastProgramInfo?.Mode is { } mode
+                    ? FocasOpMode.ToText(mode) : null,
                 "Timers/PowerOnSeconds" => TimerValue(state, FocasTimerKind.PowerOn),
                 "Timers/OperatingSeconds" => TimerValue(state, FocasTimerKind.Operating),
                 "Timers/CuttingSeconds" => TimerValue(state, FocasTimerKind.Cutting),
@@ -1317,6 +1317,18 @@ public sealed class FocasDriver : IDriver, IReadable, IWritable, ITagDiscovery,
             };
             if (value is not null)
                 return new DataValueSnapshot(value, status, sourceUtc, now);
+
+            // The program bundle has been read, but the CNC did not report this field (a refused
+            // sub-read, or no O-number in the payload). That is Bad — never a fabricated 0, and
+            // not "no such node" either.
+            if (state.LastProgramInfo is not null
+                && path is "Program/Name" or "Program/ONumber" or "Program/BlockCount"
+                    or "OperationMode/Mode" or "OperationMode/ModeText")
+                return new DataValueSnapshot(
+                    null,
+                    status == FocasStatusMapper.Good ? FocasStatusMapper.BadNoData : status,
+                    sourceUtc,
+                    now);
         }
         return null;
     }
diff --git a/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/IFocasClient.cs b/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/IFocasClient.cs
index 0bac3114..2d5d8725 100644
--- a/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/IFocasClient.cs
+++ b/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/IFocasClient.cs
@@ -238,12 +238,15 @@ public sealed record FocasSpindleName(string Name, string Suffix1, string Suffix
 ///     Program + operation-mode snapshot. Name is the currently-executing
 ///     program filename (e.g. "O0001.NC"); ONumber is its Fanuc O-number (1-9999).
 ///     Mode is the numeric code from <c>cnc_rdopmode</c> — see <see cref="FocasOpMode"/>.
+///     <b>A null field means the CNC did not report it</b> (its sub-read was refused, or the
+///     payload was too short to carry it); the driver publishes that node Bad. It is never
+///     defaulted to <c>0</c>, which is a genuine O-number, block count, and mode (MDI).
 /// </summary>
 public sealed record FocasProgramInfo(
-    string Name,
-    int ONumber,
-    int BlockCount,
-    int Mode);
+    string? Name,
+    int? ONumber,
+    int? BlockCount,
+    int? Mode);
 
 /// <summary>Human-readable text for the <see cref="FocasProgramInfo.Mode"/> integer.</summary>
 public static class FocasOpMode
diff --git a/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/Wire/WireFocasClient.cs b/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/Wire/WireFocasClient.cs
index 5f3f7c61..acc104c1 100644
--- a/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/Wire/WireFocasClient.cs
+++ b/src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/Wire/WireFocasClient.cs
@@ -217,12 +217,29 @@ public sealed class WireFocasClient : IFocasClient
             throw new InvalidOperationException(
                 $"cnc_exeprgname2 failed EW_{nameResult.Rc} and cnc_rdopmode failed EW_{modeResult.Rc}.");
 
-        var wireName = nameResult.Value;
+        return MapProgramInfo(nameResult, blkResult, modeResult);
+    }
+
+    /// <summary>
+    ///     Combine the three program sub-reads into a <see cref="FocasProgramInfo"/>, leaving any
+    ///     field the CNC did not report null. A refused read, or an <c>cnc_exeprgname2</c> payload
+    ///     too short to carry the trailing O-number, used to publish a fabricated <c>0</c> at Good
+    ///     quality — indistinguishable from a real 0 (a 31i reports O-number 0 for a program run
+    ///     by path) and, for the mode, from MDI. Ported from the sister ignitionoee driver (101a3b1).
+    /// </summary>
+    /// <param name="name">The <c>cnc_exeprgname2</c> result.</param>
+    /// <param name="blockCount">The <c>cnc_rdblkcount</c> result.</param>
+    /// <param name="mode">The <c>cnc_rdopmode</c> result.</param>
+    /// <returns>The snapshot, null where the CNC did not say.</returns>
+    internal static FocasProgramInfo MapProgramInfo(
+        FocasResult<WireProgramName> name, FocasResult<int> blockCount, FocasResult<short> mode)
+    {
+        var wireName = name.IsOk ? name.Value : null;
         return new FocasProgramInfo(
-            Name: wireName?.Name ?? string.Empty,
-            ONumber: wireName?.ONumber ?? 0,
-            BlockCount: blkResult.IsOk ? blkResult.Value : 0,
-            Mode: modeResult.IsOk ? modeResult.Value : 0);
+            Name: wireName?.Name,
+            ONumber: wireName?.ONumber,
+            BlockCount: blockCount.IsOk ? blockCount.Value : null,
+            Mode: mode.IsOk ? mode.Value : null);
     }
 
     /// <inheritdoc />
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests/FocasProgramInfoQualityTests.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests/FocasProgramInfoQualityTests.cs
new file mode 100644
index 00000000..ad2479b1
--- /dev/null
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests/FocasProgramInfoQualityTests.cs
@@ -0,0 +1,92 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Driver.FOCAS;
+using ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Wire;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests;
+
+/// <summary>
+///     "The control did not say" must read Bad, never a fabricated Good 0. Ported from the sister
+///     ignitionoee FOCAS driver (commit 101a3b1, 2026-08-12): a <c>cnc_exeprgname2</c> payload too
+///     short to carry the O-number published <c>0</c> at Good quality — indistinguishable from a
+///     31i's genuine 0 for a path-executed program. The same idiom covered every sub-read of the
+///     program bundle here: a refused <c>cnc_rdopmode</c> published Mode <c>0</c> (= MDI, a real
+///     mode) and a refused <c>cnc_rdblkcount</c> a BlockCount of 0.
+/// </summary>
+[Trait("Category", "Unit")]
+public sealed class FocasProgramInfoQualityTests
+{
+    private const string Host = "focas://10.0.0.5:8193";
+
+    private static FocasResult<WireProgramName> Name(string name, int? oNumber) => new(0, new WireProgramName(name, oNumber));
+
+    [Fact]
+    public void A_payload_without_an_O_number_maps_to_null_not_zero()
+    {
+        var info = WireFocasClient.MapProgramInfo(Name("O1111", null), new(0, 42), new(0, 1));
+
+        info.Name.ShouldBe("O1111");
+        info.ONumber.ShouldBeNull();
+        info.BlockCount.ShouldBe(42);
+        info.Mode.ShouldBe(1);
+    }
+
+    [Fact]
+    public void A_genuine_zero_O_number_stays_zero()
+    {
+        // Live Z-34184: a 256-byte payload whose o_num is present and genuinely 0.
+        WireFocasClient.MapProgramInfo(Name("//CNC_MEM/USER/LIBRARY/O1111", 0), new(0, 0), new(0, 1))
+            .ONumber.ShouldBe(0);
+    }
+
+    [Fact]
+    public void Refused_sub_reads_map_to_null_not_a_fabricated_value()
+    {
+        var info = WireFocasClient.MapProgramInfo(Name("O1", 1), new FocasResult<int>(1, 0), new FocasResult<short>(1, 0));
+
+        info.BlockCount.ShouldBeNull();
+        info.Mode.ShouldBeNull("Mode 0 is MDI — a real mode, not 'unknown'");
+
+        var nameless = WireFocasClient.MapProgramInfo(new FocasResult<WireProgramName>(1, null), new(0, 3), new(0, 1));
+        nameless.Name.ShouldBeNull();
+        nameless.ONumber.ShouldBeNull();
+    }
+
+    [Fact]
+    public async Task A_missing_field_reads_BadNoData_while_its_siblings_stay_good()
+    {
+        var client = new FakeFocasClient { ProgramInfo = new FocasProgramInfo("O1111", null, 12, null) };
+        var drv = new FocasDriver(new FocasDriverOptions
+        {
+            Devices = [new FocasDeviceOptions(Host)],
+            Probe = new FocasProbeOptions { Enabled = false },
+            FixedTree = new FocasFixedTreeOptions
+            {
+                Enabled = true,
+                PollInterval = TimeSpan.FromMilliseconds(10),
+                ProgramPollInterval = TimeSpan.FromMilliseconds(10),
+            },
+        }, "drv-1", new FakeFocasClientFactory { Customise = () => client });
+        await drv.InitializeAsync("{}", CancellationToken.None);
+
+        var deadline = DateTime.UtcNow + TimeSpan.FromSeconds(5);
+        while (DateTime.UtcNow < deadline && drv.GetDeviceState(Host)?.LastProgramInfo is null)
+            await Task.Delay(15);
+
+        var read = await drv.ReadAsync(
+            [$"{Host}/Program/Name", $"{Host}/Program/BlockCount", $"{Host}/Program/ONumber",
+             $"{Host}/OperationMode/Mode", $"{Host}/OperationMode/ModeText"],
+            CancellationToken.None);
+
+        read[0].StatusCode.ShouldBe(FocasStatusMapper.Good);
+        read[0].Value.ShouldBe("O1111");
+        read[1].StatusCode.ShouldBe(FocasStatusMapper.Good);
+        read[1].Value.ShouldBe(12);
+        read[2].StatusCode.ShouldBe(FocasStatusMapper.BadNoData);
+        read[2].Value.ShouldBeNull();
+        read[3].StatusCode.ShouldBe(FocasStatusMapper.BadNoData);
+        read[4].StatusCode.ShouldBe(FocasStatusMapper.BadNoData);
+
+        await drv.ShutdownAsync(CancellationToken.None);
+    }
+}