Automatic Heating BCM Instrukcja obsługi - Strona 8

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Modulex Controller Operation

1.7 MODBUS SOFTWARE SET-UP

The following paragraphs provide the information and proce-

dures necessary to configure the Boiler Communications

Modules (BCMs) to operate on a Modbus Network.

NOTE

The following paragraphs assume that between

1 and 9 Modulex Boilers are being controlled on

the Modbus Network.

7.7.1 BCM Set-Up for Modbus Operation

The BCM Controller can be set up for the following types of

Modbus operating modes:

• Monitoring and Configuration Only

• Modbus Direct Drive Control and Monitoring

• Modbus Remote Setpoint Control and Monitoring

In order for the BCM Controller to be recognized by the Mod-

bus Master, a valid address must be set at each BCM on the

Modbus Network. Address selection on each BCM is accom-

plished by setting rotary DIP switch SW1. This switch is loca-

ted in the lower right portion of each BCM as shown in Figure

1-11.

As Figure 1-11 shows, SW1 is a 10-position switch labeled 0

– 9. SW1 is set to the desired position using a small flat-tip

screwdriver. Figure 1-11 shows SW1 set to address 0 (zero)

which disables the BCM on the Modbus Network. Only Mod-

bus addresses 1 through 9 will be recognized by the Modbus

Master. SW1 must be set to a different position for each Modu-

lex Boiler being controlled on the Modbus Network.

Once the desired address has been set on each BCM, the

Modulex Boiler is configured for Modbus Network control by

the controlling Master EMS/BAS. In order for the BCM to act as

the Back-Up Controller if the Modbus Master signal is lost, the

ENABLE/DISABLE switch must be set to ENABLE (1).

See Appendix B for Modbus points for the BCM.

Figure 1-11. Location of BCM Address Selection Switch SW1

1.7.2 MONITORING AND CONFIGURATION

ONL Y

For monitoring and configuration only, set the 3-position switch

to position II when the E8 is controlling the boiler. The boiler

operation can be monitored via the Modbus terminals.

1.7.3 MODBUS DIRERCT DRIVE CONTROL

AND MONITORING

The BCM's modulation output can be directly driven by writing

to its Direct Drive register (Standard Holding Register). It

will ramp up the boiler based on the settings in the Standard

Holding Register or Setting Register 3000 to 3051. The default

maximum setpoint temperature limit is 85°C as shown in

The default timeout interval is 30 seconds as shown in register

3011. To prevent communication dropouts, write the direct

drive modulation value at least 3 times within the

communication timeout interval.

1.7.4 MODBUS REMOTE SETPOINT

CONTROL AND MONITORING

To send a setpoint temperature to the BCM and have it control

the boiler based on its internal settings, 3 registers need to be

adjusted:

1. the desired setpoint should be written to the Requested

Setpoint (Address 1004)in the Standard holding Registers

or Control Registers. This value should be written at least

3 times within the Communication Timeout time (Address

3011).

2. The Heat Request Command (Control Register Address

1021) should be set to 0xEE (238) to request heat.

3. If the modulation level should be allowed to go above

50%, adjust the Maximum Modulation Level setting (Ad

dress 1017).

NOTE

If power is lost, all Control Register settings re-

turn to their default values. Be sure to read them

regularly and refresh if necessary. The changes

to the Settings Registers are stored during

power-down.

1.7.5 EMS OR BAS SET-UP AS MASTER TO

BCM CONTROLLER SLAVES

Ref

er to the set-up instructions in the man facturer's equip-

ment manual for the Energy Management System (EMS) or

Building Automation System (BAS) being used as the control-

ling Master.