DIGESTER_GAS_MON
Digester gas envelope on methane, hydrogen sulphide and gasholder pressure, with relief call, withdrawal trip and separate utilisation and flare permits.
When to use it
Use DIGESTER_GAS_MON when digester gas is measured for methane and hydrogen sulphide and the gasholder or digester roof pressure is monitored, and that envelope has to decide whether gas may be sent to a CHP engine, may only be flared, or must not be drawn off at all.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| ENABLE | BOOL | — |
| CH4_PCT | REAL | % |
| CH4_OK | BOOL | — |
| H2S_PPM | REAL | ppm |
| H2S_OK | BOOL | — |
| P_MBAR | REAL | mbar |
| P_OK | BOOL | — |
| P_HI | REAL | mbar |
| P_LO | REAL | mbar |
| P_HYST | REAL | mbar |
| CH4_MIN | REAL | % |
| CH4_FLARE_MIN | REAL | % |
| H2S_MAX | REAL | ppm |
| CONFIRM_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type |
|---|---|
| OK | BOOL |
| VENT_CMD | BOOL |
| TRIP | BOOL |
| UTIL_PERMIT | BOOL |
| FLARE_PERMIT | BOOL |
| ALM_LOW_CH4 | BOOL |
| ALM_HIGH_H2S | BOOL |
| ALM_HI_PRESS | BOOL |
| ALM_LO_PRESS | BOOL |
| ALM_GAS_FAULT | BOOL |
| ALM_CFG_ERR | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DIGESTER_GAS_MON commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 9
- Simulated scans
- 143
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
- Conforms to IEC 61499
Download DIGESTER_GAS_MON — free
Create a free Ri Tech account to download the block. You get the Structured Text body, the Rockwell Add-On Instruction (.L5X), the Schneider Control Expert DFB (.XDB), PLCopen XML, the IEC 61499 function block type (.fbt) and the datasheet.
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