YOKOGAWA YS100 series instrument

8 ADRS RS-485 instrument addresses 1~16. Multiple instruments cannot be duplicated and are not related to DCS-LCS communication

9 STBIT RS-485 stop bits 1 and 2 need to be consistent with the monitoring computer settings

10 PAR RS-485 parity check NO (no check) NO, ODD, EVENT need to be consistent with the monitoring computer settings

11 BPS RS-485 baud rates 1200, 2400, 4800, 9600 need to be consistent with the monitoring computer settings

（2） Computer mode settings

1. Mode type and scope of application

The YS100 series instrument supports two computer modes for achieving deep control of the instrument by the monitoring system:

SPC mode: The monitoring system sends a set value (SV), and the instrument automatically runs according to the set value;

DDC mode: The monitoring system sends operation signals (MV), and the instrument directly outputs the signal;

Applicable restrictions: Only YS150 and YS170 support SPC and DDC modes; YS131, YS135, and YS136 do not support computer mode.

2. C mode configuration

C mode activation: When the "C" key LED of the instrument front-end operation mode key lights up, it enters C mode, which is divided into CAS (cascade mode) and CMP (computer mode);

CAS mode: Receive external cascaded input signals (1-5V) as the set values for YS150/YS170, YS135, and YS136;

CMP mode: CMOD1 (YS135/YS136 only CMOD1) needs to be set as CMP in the CONFIG2 menu. At this time, the set value or operation value can be set from the monitoring computer through SPC/DCD mode.

3. Backup mode settings

Trigger condition: In computer mode, if the instrument does not receive a monitoring system signal or receives a Fail signal, it is determined as a monitoring system failure and automatically switches to backup mode;

Mode options: YS150/YS170 can be set through the BMOD1/BMOD2 parameters in the CONFIG2 menu. BUA is the automatic backup mode, and BUM is the manual backup mode (maintaining output); YS135/YS136 default to fixed BUM mode;

Recovery mechanism: After the monitoring system returns to normal, the instrument needs to manually switch back to computer mode or trigger recovery through communication commands.

（3） Operating mode switching rules

1. YS150/YS170 (RS-485 communication)

Core mode: Supports AUT (automatic), MAN (manual), CAS (cascade), SPC (computer set value control), DDC (computer operation value control), BUA/BUM (backup mode);

Switching logic: SPC/DCD mode is activated through CMP mode, and switches to BUA/BUM when the monitoring system fails; Manual operation can switch between AUT/MAN through the "A/M" button on the panel. In computer mode, you need to exit CMP mode before switching;

Special rule: When using selector control, CMOD2 must be set to CAS; When the DDC status is ON (DDCF1=1) and the mode is AUT/MAN, pressing the C key can directly switch to DDC mode.

2. YS150/YS170 (DCS-LCS communication)

Mode correspondence: The LOOP status displayed on the DCS operator station corresponds one-to-one with the instrument mode, AUT corresponds to automatic mode, MAN corresponds to manual mode, CAS corresponds to cascade mode, and SPC/DCD corresponds to computer mode;

Operation permissions: The DCS side can modify SV (automatic mode) and MV (manual mode). In computer mode, only commands can be sent through the monitoring system, and the DCS side cannot directly modify the set values.

3. YS135/YS136 (Universal Communication)

YS135: Supports CAS (cascade, output CIN1 input value), MAN (manual, output manual set value), DDC (computer mode, output monitoring system set value), DDC mode cannot be activated from the DCS side;

YS136: Supports CAS (cascade, output CIN1 input value), MAN (manual, output manual operation value), DDC (computer mode, output monitoring system operation value), MV setting is only available in MAN mode.