Ladder Logic Implementation

Ladder logic for an APACS+ system is implemented

in the ACM controllers, not in the I/O modules. Thus,

any digital I/O point in the system can be used as an

input or output to the ladder logic running in the

ACM. A similar capability exists with the migrated

APACS+ system through the use of sequence control

logic in the FCP280. FCP270 or ZCP270 Control

Processor.

Foxboro control block ladder logic is implemented by

using a combination of logic which executes directly

in the digital I/O modules and sequence control logic

in the Control Processor. This same capability exists

in the AID115. AID230. AOD115. and ADO125

APACS+ migration modules. The channel

configurable ASAM01. AEAM01. ASDM24 and

ASDM48 I/O modules implement ladder logic only by

using sequence control logic in the Control Processor

similar to the original APACS+ system.