Siemens SIMATIC BATCH Operating Manual page 399

Start lock with IEPH and IEOP interface blocks
With the IEPH and IEOP interface blocks, the recipe phase takes into account the start lock
according to the following diagram:
Image 9-16 Start lock with interface blocks
● If the start lock is already set after the equipment phase is allocated, the recipe phase only
writes the setpoints without the ISTART input. Instead, the recipe phase writes the IPARAM
input to inform the equipment phase that there are new setpoints. The equipment phase
then checks the setpoints and resets the IPARAM input and the start lock.
● Even when the equipment phase reaches the HELD status, it can still set the start lock to
prevent a RESUME. No parameter trigger is necessary because the recipe phase does not
permit a parameter change while a step is active.
Startup characteristics for SFC types
To achieve faster step change times, the startup characteristics of the SFC types have been
optimized as of SIMATIC BATCH V6.1.
Regardless of any start lock, SIMATIC BATCH always writes the allocations, the setpoints,
the IPARAM and the start command in a write job to the block. The SFC type checks the
setpoint values for useability and executes the start/rejects the start.
SIMATIC BATCH V8.2
Operating Manual, 02/2016, A5E35958174-AA
BATCH Control Center
9.8 Batch control
399