TAMAGAWA TS5313N122 TS5313N122 TS5313N122 TS5313N122 TS5313N122 TS5313N122

TS5016N60

Guang Zhou Lai Jie Electric Co.,LTD

TS1508N202

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TS3501N

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TS3218N42

TS1508N77

TS3684N2E6

TS3653N12E6

TS3624N203E5

TS2013N191E26

TS3510N39E10

TS4509N1831E200

TS3218N5

TS1508N85

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TS3624N22E4

TS2014N181E32

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TS4509N2002E200

TS3250E12

TS1526N55

TS3692N103

TS3624N2E3

TS3624N23E5

TS2014N311E32

TS3617N2E7

TS4509N2405E200

Modbus master instructions may execute in only one of the program
cycle or cyclic/time delay execution levels. They must not execute in both execution
priority levels. Pre-emption of a Modbus Master instruction by another Modbus master
instruction in a higher priority execution priority level will result in improper operation.
Modbus master instructions must not execute in the startup, diagnostic or time error
execution priority levels.
● Once a master instruction initiates a transmission, this instance must be continually
executed with the EN input enabled until a DONE=1 state or ERROR=1 state is returned.
A particular MB_MASTER instance is considered active until one of these two events
occurs. While the original instance is active, any call to any other instance with the REQ
input enabled will result in an error. If the continuous execution of the original instance
stops, the request state remains active for a period of time specified by the static variable
Blocked_Proc_Timeout. Once this period of time expires, the next master instruction
called with an enabled REQ input will become the active instance. This prevents a single
Modbus master instance from monopolizing or locking access to a port. If the original
active instance is not enabled within the period of time specified by the static variable
"Blocked_Proc_Timeout", then the next execution by this instance (with REQ not set) will
clear the active state. If (REQ is set), then this execution initiates a new master request
as if no other instance was active.0 = No request; 1 = Request to transmit data to Modbus Slave
You may control this input either through the use of a level or edge triggered contact.
Whenever this input is enabled, a state machine is started to ensure that no other
MB_MASTER using the same instance DB is allowed to issue a request, until the current
request is completed. All other input states are captured and held internally for the current
request, until the response is received or an error detected.
If the same instance of MB_MASTER is executed again with REQ input = 1 before the
completion of the current request, then no subsequent transmissions are made. However,
when the request is completed, a new request is issued whenever MB_MASTER is executed
again with REQ input = 1.
DATA_ADDR and MODE parameters select the Modbus function type
DATA_ADDR (starting Modbus address in the slave): Specifies the starting address of the
data to be accessed in the Modbus slave.
The MB_MASTER instruction uses a MODE input rather than a Function Code input. The
combination of MODE and Modbus address determine the Function Code that is used in the
actual Modbus message. The following table shows the correspondence between parameter
MODE, Modbus function code, and Modbus address rangeRead the slave communication status word and event
counter. The status word indicates busy (0 – not busy,
0xFFFF - busy). The event counter is incremented for
each successful completion of a message.
Both the DATA_ADDR and DATA_LEN operands of
MB_MASTER are ignored for this function.
80 08 1 Check slave status using data diagnostic code 0x0000
(Loopback test – slave echoes the request)
1 word per request
81 08 1 Reset slave event counter using data diagnostic code
0x000A
1 word per request
3 to 10,
12 to 79,
82 to 255
Reserved
1 For "Extended Addressing" mode the maximum data lengths are reduced by 1 byte or 1 word depending upon the data