80 lines
2.6 KiB
Markdown
80 lines
2.6 KiB
Markdown
# Splitter Detection Logic in IO.lsp
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## Overview
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The script decides whether to create a **single cable** or **two cables + splitter** based on the DESCA values in each pair.
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## Decision Flow
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### Step 1: Check if both DESCA values are filled
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```
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If val1 = "" OR val2 = ""
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→ Go to Case 2 (single value handling)
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Else (both val1 and val2 have values)
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→ Go to Case 1 (pair handling)
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```
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### Step 2: Case 1 - Both values filled (Pair handling)
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#### For FIO/FIOH blocks (special handling at lines 318-427):
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**SPLITTER CREATED** if:
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- Both values contain "TPE" AND they're different names (e.g., TPE2 vs TPE3)
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- One contains "RCV" and other contains "SND" (or vice versa)
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**SINGLE CABLE** if:
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- None of the splitter conditions above match → default to single cable
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#### For all other blocks (VFD, SIO, etc. at lines 432-445):
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**SINGLE CABLE** if values match any of these patterns:
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- Both contain "SEL"
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- Both contain "DPM"
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- Both contain "VFD" AND both contain "STO"
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- One contains "_PB" and other contains "_PB_LT" (pushbutton + light)
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- Both contain "BCN" (beacon stack)
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- Both contain "EPC"
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- Both contain "SSP"
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**TWO CABLES + SPLITTER** if:
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- None of the single-cable conditions match → default to splitter
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## Summary Table
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| DESCA1 Pattern | DESCA2 Pattern | Result |
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|----------------|----------------|--------|
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| `*_SEL*` | `*_SEL*` | ✅ Single cable |
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| `*_DPM*` | `*_DPM*` | ✅ Single cable |
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| `*VFD*STO*` | `*VFD*STO*` | ✅ Single cable |
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| `*_PB*` | `*_PB_LT*` | ✅ Single cable |
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| `*_PB_LT*` | `*_PB*` | ✅ Single cable |
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| `*BCN*` | `*BCN*` | ✅ Single cable |
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| `*EPC*` | `*EPC*` | ✅ Single cable |
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| `*SSP*` | `*SSP*` | ✅ Single cable |
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| `*TPE*` (different) | `*TPE*` (different) | ⚠️ **SPLITTER** (FIO only) |
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| `*RCV*` | `*SND*` | ⚠️ **SPLITTER** (FIO only) |
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| `*SND*` | `*RCV*` | ⚠️ **SPLITTER** (FIO only) |
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| Anything else | Anything else | ⚠️ **SPLITTER** |
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## Key Code Locations
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- **Lines 318-332**: FIO/FIOH splitter conditions (TPE pairs, RCV/SND pairs)
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- **Lines 432-445**: All other blocks - single cable conditions
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- **Lines 505-519**: Default ELSE branch - creates splitter for unmatched pairs
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## Example Scenarios
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1. **Beacon stack** (`BYDC_6_BCN1_A` + `BYDC_6_BCN1_H`):
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- Both contain "BCN" → ✅ Single cable (line 443)
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2. **Pushbutton + light** (`*_PB` + `*_PB_LT`):
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- Pattern match → ✅ Single cable (lines 440-441)
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3. **TPE pairs** (`*TPE1` + `*TPE2`):
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- For FIO blocks → ⚠️ Splitter (lines 322-324)
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- For other blocks → ⚠️ Splitter (default)
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4. **Two different devices** (e.g., `*DEVICE1` + `*DEVICE2`):
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- No pattern match → ⚠️ Splitter (default)
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