Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 452

■Disable alarm detection
Set whether to detect alarms (ALM) or not in the variation rate & high/low limiter and heater burnout detection.
Item
Disable alarm detection by setting tag data
Disable alarm detection by control mode selection
Disable alarm detection by loop stop processing
■Heater burnout detection
HBOA occurs if the manipulated value for heating is at the high limit value (MH_HT) for a time period longer than the time
period specified with HBOTIME.
HBOA is reset when the manipulated value for heating falls below the high limit value (MH_HT).
■Temperature error detection in the primary loop
When TEMPALM_EN is TRUE and HHA (input high high limit alarm) has occurred in the primary loop, this function block sets
the manipulated value for heating to the low limit value of the manipulated value for heating (ML_HT).
■Loop stop processing
When the stop alarm (SPA) of the alarm (ALM) or the tag stop (TSTP) of the monitor output buffer (DOM) is TRUE, this
function block performs the following processing.
• Outputs (MVN_HT, MVN_CL) are held.
• The control mode is automatically changed to MANUAL.
• When DMLA_HT, MHA_HT, MLA_HT, DMLA_CL, MHA_CL, MLA_CL, or HBOA of the alarm (ALM) has occurred, the
DMLA_HT, MHA_HT, MLA_HT, DMLA_CL, MHA_CL, MLA_CL, or HBOA is reset.
• No alarm is detected in the variation rate & high/low limiter and heater burnout detection.
12 LOOP TAG
450
12.40 Heating and Cooling Output (M+M_HTCL_T_)
Disable alarm detection processing
If the following bits in the disable alarm detection (INH) are TRUE, DMLA_HT,
MHA_HT, MLA_HT, DMLA_CL, MHA_CL, MLA_CL, or HBOA of the alarm
(ALM) will not be detected.
• ERRI
• DMLI_HT
• MHI_HT
• MLI_HT
• DMLI_CL
• MHI_CL
• MLI_CL
• HBOI
In MAN or CMV mode, DMLA_HT, MHA_HT, MLA_HT, DMLA_CL, MHA_CL,
MLA_CL, and HBOA of the alarm (ALM) are reset and the DMLA_HT,
MHA_HT, MLA_HT, DMLA_CL, MHA_CL, MLA_CL, or HBOA will not be
detected.
Page 450 Loop stop processing