User manual OMRON WS02-PSTC1-E V1.8

[. . . ] W344-E1-09 SYSMAC WS02-PSTC1-E CX-Protocol Ver. 1. 8 OPERATION MANUAL SYSMAC WS02-PSTC1-E CX-Protocol Ver. 1. 8 Operation Manual Revised February 2009 iv Notice: OMRON products are manufactured for use according to proper procedures by a qualified operator and only for the purposes described in this manual. The following conventions are used to indicate and classify precautions in this manual. [. . . ] Reset the first operand of the PMCR instruction. Otherwise, transfer the sequence number to the PMSU. The received data overflowed when Specify another area. Otherwise, reduce the receive data size. Rewrite the protocol data by using the Protocol Support Tool. 191 Communications Response Time Performance Section 4-8 The data send/ receive is not well executed despite the PMCR instruction execution. 28912 is Port B Communications with the connected devices is impossible. Problem 28909 is ON (Port A) or 28913 is ON (Port B). 28304 is ON (Port A) or 28312 is ON (Port B). Cause The step is executed the error process during the sequence because the receive message does not match with the expected receive message. The communications error occurred during the message receive. Action Search the error cause and add the appropriate process. Confirm the communications route to the connected devices. 28304 is ON (Port A) or 28312 is ON (Port B). PMCR instruc- ER Flag (25503) is ON. tions are not executed. This error occurred due to an abnor- · Restart the problem port or initialize each mal communications route to the conrelay by executing the nected devices or by a RXD and PMCR communications condition setting failinstructions. The details are registered as error codes. · Confirm the communi28300 to 03 (Port A) cations route. 28608 to 11 (Port B) · Check the communications condition setting. This error occurs by the instruction Check the instruction operand setting failure. operand. 4-8 Communications Response Time Performance The response performance of communications with the external devices using PMCR instruction, which varies according to the definition of the Protocol Macro, is divided in the following four modes: · Use the event (operand addressing) areas · Use the interrupt mode for the response type · Use the link word area · Use the direct addressing 192 Communications Response Time Performance Section 4-8 The previous four modes are different in data transmission mode between the CPU Unit and the Board/Unit. There are three kinds of data transfer modes from the CPU Unit to the Board/Unit, while there are four kinds of data transfer modes from the Board/Unit to the CPU Unit. The communications response time varies according to the combination of those modes. Use the event area Use the event area Use the interrupt mode Protocol Support Board Use the link word area CPU unit Use the link word area Use the direct addressing Use the direct addressing 4-8-1 CS/CJ · Communications Response Time Using the Event (Operand Addressing) Area Illustrated below is the data flow when the communications area addressed by the third and the fourth operand of the PMCR instruction is used: CPU Unit PMSU External device PMCR #0110 #0000 D0000 D1000 D0000 PMCR instruction process Send data conversion process 1 D1000 2 3 External device process Received data writing Received data conversion process 7 6 5 4 The communications response time is the total time from 1 to 7 in the above figure. 193 Communications Response Time Performance Section 4-8 Number Function 1 PMCR instruction process time 2 Send data conversion process time Time Required 15 ms + two-cycle time maximum Depends on the number of conversion bytes 3 Send data transmission time Number of data characters x one-character bit/ transmission rate Depends on the external device process 4 External device process time 5 Received data transmission time Number of data characters x one-character bit/ transmission rate 6 Received data conversion process time Depends on the number of conversion bytes 7 Received data writing process time Board: One-cycle time maximum Unit: Two-cycle time maximum Description The internal process time from the start of PMCR instruction to the end of the data transfer to the Board/Unit. The time required for the send data conversion based on the specified conversion mode which finishes at the start of data sending to the external device. The time required for the send data transmission to the external device. (Use double the calculated time because idle time exists between send characters. ) The time required for the external device process according to the PLC's command which finishes by the start of the response data sending. The time required for the received data transmission from the external device. (Use two to five times the calculated time because idle time exists between the receive characters. ) The time required for the received data conversion from the external device based on the specified conversion mode which finishes at the end of data transfer The time required to finish received data transfer to I/O memory. Note Although the data conversion process times of 2 and 6 vary according to the PLC operation status, the maximum values can roughly be estimated by the following calculation formula: 2: The send data conversion process time = 10 ms + one-byte conversion time x number of conversion bytes Reverse conversion: 5 µs, ASCII reverse conversion: 4 µs, hexadecimal reverse conversion: 7 µs (One-byte conversion time No conversion: 1 µs, reverse conversion: 5 µs, ASCII conversion: 10 µs, ASCII reverse conversion: 4 µs, hexadecimal conversion: 7 µs, hexadecimal reverse conversion: 7 µs) 6: The receive data conversion process time = 2 ms + one-byte conversion time x number of conversion bytes (One-byte conversion time No conversion: 1 µs, reverse conversion: 4 µs ASCII conversion: 8 µs, ASCII reverse conversion: 9 µs, hexadecimal conversion: 17 µs, hexadecimal reverse conversion: 17 µs) 194 Communications Response Time Performance Section 4-8 · Communications Response Performance Using the Interrupt Notification Mode Illustrated below is the data flow when the event area (operand addressing) is used and the response type is the interrupt mode. The interrupt notification mode is only available with the Serial Communications Board. CPU Unit PMSU External devices PMCR #01E1 #0000 D0000 D1000 D0000 PMCR instruction process Send data conversion process D1000 1 2 3 External device process Board interrupt process Received data conversion process 7 6 5 4 The communications response time is the total time from 1 to 7 in the above figure. 195 Communications Response Time Performance Section 4-8 Number Function 1 PMCR instruction process time 2 Send data conversion process time Time Required 15 ms + two-cycle time maximum Depends on the number of conversion bytes 3 Send data transmission time Number of data characters x one-character bit/ transmission rate Depends on the external device process 4 External device process time 5 Received data transmission time Number of data characters x one-character bit/ transmission rate 6 Received data conversion process time Depends on the number of conversion bytes 7 Board interrupt process time About 50 µs (+0 to 2 ms) (see note) Description The time from the start of PMCR instruction to the end of the data transfer to the Board. [. . . ] Page 26: Section reference added at top of page. Page 35: Supported networks and connection with PLCs updated. Page 40: Windows versions added and PLC models added. Pages 98, 249, 287, and 336: "/CJ" or "/CP" added. [. . . ]