وصف

Yokogawa ACM11 RS-232C Communication Module

Configured for serial data exchange in Yokogawa CENTUM distributed control systems, the Yokogawa ACM11-S2 (base model ACM11 RS-232C Communication Module) provides direct physical and electrical execution of point-to-point data links between Field Control Units and external subsystems.

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa ACM11-S2
Origin	Japan
Weight	0.86 kg
Dimensions	Proprietary slot-in card form factor
Operating Temp	-20 degC to +70 degC
Power Consumption	< 1.0 W
Interface Standard	RS-232C
Data Rate	Up to 230 kbps
Connection Distance	Up to 15 m (without line drivers)
Supported Protocols	LFS2210 (FA-M3), LFS2211 (DARWIN)

FOUNDATION Fieldbus and Profibus PA Connectivity

The ACM11 operates within legacy CENTUM I/O architectures where integration with fieldbus-connected instruments requires deterministic timing alignment at the module level. In multi-drop configurations, channel-level synchronization ensures that RS-232C data packets do not collide with parallel fieldbus schedules. Electrical noise immunity is maintained through backplane shielding practices consistent with Yokogawa’s analog/digital I/O nests.

Frequently Asked Questions

Q: Can the ACM11 be hot-swapped while the Node Interface Unit is powered?

A: No. Removal or insertion must occur only after confirming zero backplane power to prevent transient voltage spikes.

Q: Is firmware upgrade possible directly on the ACM11 hardware?

A: Firmware functions are handled by the host system software; the module itself contains no user-upgradable firmware storage.

Q: What is the maximum sustained data throughput under protocol LFS2210?

A: Throughput depends on cable length and connected device latency but will not exceed 230 kbps per RS-232C limits.

Field Installation Guidelines

Mount the ACM11 into a designated Analog/Digital I/O Module Nest (AMN11/AMN31 or compatible Node Interface Unit). Ensure all mounting latches fully engage to maintain proper backplane contact. Use shielded twisted-pair cabling for RS-232C connections, terminating the shield at the nest ground point only. Maintain separation from high-voltage power wiring to reduce electromagnetic interference. Verify pin assignments against the subsystem documentation before applying power.

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