Hold Mode - Siemens SIMATIC PCS 7 CPU 410-5H System Manual

Startup of the standby CPU
The standby CPU startup routine does not call an OB 100 or OB 102.
The standby CPU checks and assigns parameters for the following:
● the one-sided I/O including CPs and FMs assigned to it
Special features at startup
During a Power On with battery backup of a CPU 410 with large configurations containing
many CPs and/or external DP masters, it may take up to 2 minutes until a requested warm
restart is executed. During this time, the LEDs on the CPU light up successively as follows:
1. All LEDs light up.
2. The STOP LED flashes as it does during a memory reset.
3. The RUN and STOP LEDs are flashing.
4. The RUN LED flashes briefly 2 to 3 times.
5. The STOP LED lights up.
6. The RUN LED starts flashing again.
This begins the start up.
Additional information
For detailed information on STARTUP operating state, refer to Manual
STEP 7
7.1.4

HOLD mode

The HOLD mode is for test purposes. You need to have set respective breakpoints in the
user program for this purpose. It can only be reached from the RUN mode.
Special features in redundant mode
A transition to HOLD is only available during STARTUP and in RUN in single mode. It is not
possible to set breakpoints when the fault-tolerant system is in redundant system mode.
Link-up and update operations are not available while the CPU is in HOLD mode; the
standby CPU remains in STOP which is logged in the diagnostics buffer.
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
.
Operator controls and operating modes of the CPU 410-5H
7.1 Operating modes of the CPU 410-5H
Programming with
103