Toshiba V Series User Manual page 55

(4) LED indications
• HALT LED (HLT)
The HALT LED remains unlit while the LD unit is operating normally. It lights or blinks
under the following conditions.
LED status
ON
OFF
• ALARM LED (ALM)
The ALARM LED lights for the alarms shown below, and goes out when all the
alarms are cleared.
ON
• Computer/Local LED (CMP)
This LED lights under the following conditions.
ON
• Remote/Manual LED (REM)
This LED lights under the following conditions.
ON
6F8C1005
Table 1-31 HALT LED
• LD unit CPU module error
• LD unit memory (RAM/ROM) error
• Transmission error (CPU module - LD unit)
• MV error (LP_DATA.MVE)
• Control inactive (LP_DATA.CLI)
• PV processing error (PV_DATA.PRE)
• Device error (PV_DATA.PDE)
• Under simulation (PV_DATA.SIM, LP_DATA.SIM) (Linearize simulation)
Table 1-32 ALARM LED
LED status
• Sensor error (PV_DATA.PVI)
• PV high alarm (PV_DATA.PVH)
• PV low alarm (PV_DATA.PVL)
• PV rate of change alarm (PV_DATA.PVD)
• MV deviation alarm (LP_DATA.DVE)
• MV valve position alarm (LP_DATA.VPI) (pulse only)
Table 1-33 Computer/Local LED (CMP)
LED status
CMP-SV intervening (LP_DATA.CSV)
CMP-MV intervening (LP_DATA.CMV)
CMP intervening (LP_DATA.CMP)
Control mode (RM): RM control mode is selected in MV operation
(M mode) from LD unit, and CMP LED lights upon receipt of return
signal from L1.
Table 1-34 Remote/Manual LED (REM)
LED status
• Pulse output loop (LP02/LP04) has stopped output as R/M sig-
nal is manually input.
1.7 Software Functions
Possible cause
Description
Description
Description
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